MallowbyNames

Leo

LEE-oh · From Latin leo, "lion," long used both as a name in its own right and as a short form of Leonard, Leopold, and Leonardo.

2025 rank (boys)
#19
Babies named in 2025
8,173
Peak popularity
1903
2025 frequency
1 in 209 boys
Usually for
Boys
Trend
Rising since 1989

A 1900s favorite, climbing again.

Popularity of Leo since 1880

Babies named Leo per year in U.S. Social Security records. Raw births topped out in 2022, but relative to how few babies were recorded back then, Leo's real moment was 1903.

2.8k5.5k8.3k1880192019602000Most births 2022Boys
Data table (by decade)
DecadeBoys
1880s2,098
1890s4,691
1900s5,629
1910s26,656
1920s36,960
1930s22,864
1940s16,962
1950s15,536
1960s9,487
1970s5,365
1980s4,541
1990s4,738
2000s12,274
2010s44,706
2020s47,481

Meaning & origin

Lion in Latin, a papal name since the fifth century, most recently Leo XIV, elected in 2025, and casual enough for a guitar maker from Fullerton, Leo compresses a lot of range into three letters. It works across languages without alteration, which increasingly matters to American parents, and it needs no nickname because it essentially is one.

The Social Security record shows a textbook century-long round trip. Leo peaked in 1903, a favorite of immigrant-era families, then receded steadily until 1989, when the modern climb began. By 2025 it had reached No. 19, roughly 1 in every 209 boys, its strongest showing since the days when its bearers arrived through Ellis Island.

Today the name runs best in Vermont, the District of Columbia, and South Dakota, a spread wide enough to suggest broad-spectrum rather than coastal-niche appeal. Stylistically it anchors the short-vintage-international cluster: Milo, Felix, and Mateo for brothers, Ivy and Stella for sisters.

Leo is the Latin word for lion, cognate with Greek leōn, and it has been a personal name since antiquity, borne by Byzantine emperors and by a long line of popes, from Leo the Great in the fifth century to Leo XIV, elected in 2025. It doubles as the natural short form of Leonard, Leopold, and Leonardo, and as the conventional English rendering of Slavic Lev, which is how Tolstoy became Leo in translation. In American records the name was strongest among turn-of-the-century families, its peak came in 1903, before a long mid-century fade. The climb back began in 1989, and the 2020s have returned Leo to the top 20 for the first time in over a century.

Read more: Leo on Wikipedia

Where Leo is most popular

Births per 100,000 boys by state. Press play or drag the slider to watch it move across the decades. The lightest shade means too few recorded births.

2020s
Fewermore per 100k boystoo few births

Leo” around the world

Where Leo lands in the latest official birth statistics abroad, matched to the U.S. spelling.

  • France

    #4

    in 2024

  • Ireland

    #10

    in 2025

  • New Zealand

    #6

    in 2025

  • Quebec

    #2

    in 2025

  • Australia (NSW)

    #5

    in 2025

Sources: INSEE (France) · CSO Ireland (Ireland) · NZ Dept of Internal Affairs (New Zealand) · Retraite Québec (Quebec) · NSW Registry of BDM (Australia (NSW)).

Nicknames & variants

Variants: Léo, Leon, Lev

Famous people named Leo

  • Leo Tolstoy · Russian novelist (the anglicized form of Lev)
  • Leo Fender · founder of the Fender guitar company

Sibling names for Leo

Names that share Leo's style, for a brother or sister.

Sisters: Ivy, Stella, Cora, Ruby, Mila, Aria, Aurora, Ella, Ellie, Emma, Lily, Luna, Mia, Nora, Sofia, Sophie, Alisa, Annie, April, Autumn, Beatrice, Cecilia, Clara, Daisy, Dora, Erma, Eva, Evie, Flora, Gemma, Gina, Haven, India, Jewel, Julia, June, Karla, Lana, Lena, Lila, Lilly, Lola, Marcella, Nia, Nina, Nola, Olive, Penny, Rita, Rosa, Sienna, Stevie, Viola, Vivian, Wanda, Winnie, Adele, Adelle, Aila, Aja, Akia, Alba, Alesia, Alina, Alita, Amaya, Ami, Arya, Asia, Athena, Avaya, Avis, Bela, Birdie, Caia, Cami, Candida, Celene, Celia, Cher, Cherry, Cleo, Coco, Coral, Corine, Corinna, Dahlia, Dalia, Dania, Dasha, Delia, Dessa, Edie, Elana, Elara, Elda, Elina, Elli, Elma, Elsa, Emerald, Era, Esme, Estel, Farrah, Fay, Ferne, Flor, Frida, Genia, Gia, Gilda, Gisele, Goldie, Hana, Harlow, Holli, Ila, Ilene, Ina, Indie, Iva, Ivory, Jaide, Jemma, Kalli, Kami, Karmen, Kaya, Kehlani, Kia, Kira, Kora, Kya, Lara, Leia, Leota, Leyna, Lilith, Lilli, Lilyann, Lina, Livia, Lluvia, Lona, Lucero, Lucie, Lulu, Lyra, Mai, Maia, Maisie, Mari, Mariel, Marlo, Marnie, Mayra, Meda, Melina, Mickie, Mika, Miki, Milana, Milena, Mimi, Mina, Mira, Mischa, Miya, Mona, My, Mylah, Myrtis, Nala, Nana, Neva, Nita, Noma, Nona, Norah, Nya, Nyssa, Odessa, Ola, Oma, Ona, Ora, Ottie, Palma, Pepper, Phoebe, Raya, Rayna, Regina, Reina, Remi, Rena, Renata, Renita, Reta, Rhea, Roma, Rosella, Rosy, Roxie, Rubi, Rya, Sabina, Scarlet, Siena, Sol, Sommer, Starr, Sunny, Sunshine, Suri, Taja, Tana, Taya, Terra, Thea, Theda, Tia, Vada, Vera, Vesta, Vida, Vina, Violette, Vira, Winter, Wren, Yara, Yetta, Zaria, Zelda, Zena, Zoe, Zya, Acacia, Adalia, Adia, Adora, Aeris, Aira, Airam, Alix, Alys, Amerie, Amor, Anai, Anel, Ani, Anise, Annah, Ara, Arla, Aura, Aurea, Autum, Avia, Avyanna, Bea, Bebe, Bee, Berna, Bina, Blossom, Calla, Calli, Cally, Camelia, Charly, Cherri, Chi, Cleone, Crysta, Dafne, Daina, Daisey, Damya, Darya, Dava, Dea, Delta, Dimple, Dori, Dreama, Dulcie, Dyani, Eda, Elza, Emelyn, Emmi, Ena, Enola, Esmae, Evolet, Fae, Fairy, Floria, France, Gaby, Gaia, Geena, Genie, Gigi, Gypsy, Henna, Ilda, Illa, Indy, Indya, Isley, Izzy, Jani, Jhene, Jiana, Jina, Joetta, Jorja, Jovi, Jovie, Jule, Junia, Juno, Kalina, Kasha, Kateri, Kati, Keiry, Kena, Kimi, Kina, Kirra, Korra, Kyah, La, Lael, Lala, Leni, Lenna, Leonia, Lera, Lexa, Lili, Lillia, Lillith, Loria, Lossie, Luci, Maiya, Maizie, Maizy, Marni, Mayla, Mazie, Mea, Mel, Melita, Mileena, Milla, Minta, Misha, Mitzy, Myia, Naia, Neida, Nella, Nena, Neomi, Nika, Nilah, Nori, Novah, Novalee, Novaleigh, October, Olympia, Pearly, Peri, Pia, Rea, Reena, Rella, Renetta, Renna, Reya, Ria, Riana, Ricci, Risa, Romi, Romy, Rosey, Rosia, Roxy, Rumi, Ryah, Sada, Sela, Sia, Siana, Skylah, Soleil, Somer, Sula, Sunday, Sunnie, Sury, Taina, Tanna, Tavia, Tea, Teah, Tesa, Thais, Tiny, Tisa, Tobi, Tomi, Tula, Vania, Vanna, Velia, Vella, Vena, Verena, Veta, Xenia, Zada, Zadie, Zaya, Zelie, Zeta, Zetta, Zhuri, Zina, Zita, Zoya, Adaia, Adelie, Aeva, Aija, Aina, Airis, Aisa, Aiya, Akiya, Aliene, Alis, Alla, Allora, Allura, Amarra, Amela, Amour, Anely, Anni, Annia, Annya, Anthea, Anyia, Aprill, Aralynn, Arena, Arina, Arisa, Ariza, Arly, Arma, Aryia, Audre, Aurie, Avanti, Ave, Avila, Avy, Ayari, Ayiana, Azara, Azelia, Azuri, Beata, Bellah, Beryle, Bonnita, Caiya, Cala, Camora, Camya, Carmin, Cayenne, Cece, Chanie, Clarie, Clary, Clea, Cleona, Coni, Conni, Corra, Cricket, Daizy, Dari, Dasie, Deisi, Dela, Dema, Demia, Dera, Dima, Diva, Eevee, Elese, Elianah, Elis, Elize, Elka, Ellar, Ellorie, Emya, Enna, Eri, Eriel, Esly, Esmee, Eufemia, Evalee, Evey, Evi, Eydie, Ezmae, Fancy, Fanta, Florie, Gaelle, Gari, Giabella, Giannah, Gianny, Ginna, Glee, Glori, Ha, Halina, Harlo, Havanna, Hazely, Iana, Idy, Ilia, Ily, Inda, Indi, Inna, Itza, Ivee, Ivorie, Iyona, Iza, Jeena, Jema, Jocie, Joei, Jojo, Joli, Josetta, July, Juna, Juni, Kahli, Kaiah, Kana, Kaoir, Karyna, Katha, Kayra, Kela, Khalea, Khelani, Kiki, Kimya, Kior, Kiri, Kleo, Konnie, Kyri, Lamaya, Landa, Lari, Leira, Leoda, Leoma, Leotha, Letta, Lidya, Ligia, Lillis, Lilyrose, Litzi, Livy, Loa, Lore, Loreta, Loula, Lua, Lumen, Lumi, Lunna, Lylia, Lyna, Lynde, Lynea, Ma, Maevis, Makaia, Makya, Mar, Maraya, Marea, Maribella, Mataya, Matia, Mayar, Meeka, Meela, Meia, Meila, Meka, Mela, Melah, Melana, Mera, Merla, Meya, Milee, Mili, Milka, Milli, Mily, Mio, Moncia, Moxie, Mysha, Nalah, Nani, Narda, Navia, Nela, Nely, Netta, Neyla, Nikka, Nollie, Noni, Olivette, Olla, Patria, Peaches, Perl, Perrie, Persia, Posie, Prisca, Raia, Raini, Raissa, Raiya, Reesa, Rei, Rema, Remie, Resa, Rheya, Rinoa, Riverlyn, Roanna, Romee, Rosaly, Rosebud, Roselia, Rosi, Rossy, Roxi, Roza, Rubina, Runa, Sadi, Sativa, Seleste, Selia, Senna, Shella, Silva, Simi, Solara, Sole, Solei, Soleia, Sonna, Starlet, Starlett, Starlette, Starlyn, Starlynn, Sylva, Taia, Taiya, Tally, Tani, Tava, Teia, Tela, Thera, Tinia, Tiya, Valeta, Valli, Vega, Vela, Veyda, Vila, Villa, Violett, Vivi, Vivia, Vola, Willo, Wrenn, Xandra, Xara, Xia, Xiana, Xoe, Yides, Yuli, Zaidee, Zaila, Zaiya, Zalia, Zanya, Zaylah, Zeena, Zela, Zelia, Zemira, Zera, Zianna, Ziara, Zo, Zooey, Zori, Zoria, Zowie, Zully, Zuly, Zury, Zyanna, Abri, Adalei, Adream, Adri, Ahlia, Alaena, Alexas, Aliz, Alizea, Aluna, Amai, Amzie, Anaeli, Angeleen, Anishka, Anu, Anyae, Aquila, Areya, Arora, Arria, Ase, Astella, Astra, Atina, Atira, Aurorah, Aury, Avanni, Ayde, Aytana, Azalia, Azaylia, Balbina, Bali, Bellami, Briony, Calaya, Caro, Caya, Ceclia, Celes, Charie, Charlei, Chia, Chlora, Chloris, Cielle, Clela, Cuca, Cyana, Dali, Daysy, Desa, Devita, Deysy, Dhalia, Dia, Didi, Domino, Dore, Eevie, Elesa, Ellarie, Ellsie, Emaya, Eria, Esti, Estreya, Evalyne, Evea, Eyla, Eylin, Ezme, Fina, Fleur, Fraya, Galena, Geana, Gola, Goldy, Graciemae, Gyanna, Halli, Hanny, Hazyl, Hedy, Hemen, Hena, Hyacinth, Ica, Iley, Io, Irisa, Isola, Itali, Ivoree, Ivyrose, Iysis, Izel, Jaeli, Jaira, Jamine, Janaia, Jewelle, Jhade, Jinora, Joia, Joury, Jozi, Juri, Juvia, Kaari, Kalii, Kaomi, Katreena, Katura, Kaula, Kayomi, Kayori, Kea, Keeana, Keni, Kharma, Khiya, Kiala, Kiko, Kla, Klaira, Kova, Labella, Laelia, Laini, Lainy, Laiza, Lalla, Larah, Lauria, Leafy, Leara, Leba, Lekia, Lenni, Leyda, Leza, Lilac, Lillah, Lilou, Lilu, Lilymae, Liona, Litha, Lolah, Lorey, Lucyle, Ludy, Luma, Lumina, Lunabella, Lunabelle, Lunah, Lusia, Lylla, Lyrah, Maezie, Maizey, Malva, Maly, Malya, Manna, Margia, Mavie, Mayetta, Mazey, Mazy, Meesha, Meily, Meli, Mella, Meyah, Milanni, Milarose, Minah, Minka, Mirra, Miyori, Monna, Morningstar, Myca, Myna, Nai, Nari, Nayvie, Ndea, Neeka, Neeva, Neli, Nema, Nene, Neya, Neytiri, Niana, Niaya, Nica, Nolie, Norina, Novalyn, Novi, Novia, Noya, Nyelli, Olivine, Onna, Opaline, Oretta, Osha, Ota, Pachia, Para, Piccola, Pina, Pola, Poppi, Prim, Prisma, Rayen, Reah, Reet, Riko, Rin, Romey, Ronia, Rosaland, Rosealee, Rubby, Rubyann, Rukia, Sadee, Saidy, Saiya, Sanii, Sarabi, Savi, September, Seri, Shasha, Siria, Sola, Solar, Solymar, Sonita, Sonyia, Starsha, Stellar, Sua, Syra, Teola, Thena, Thia, Tika, Tila, Tinna, Trini, Tulip, Vala, Valera, Vee, Venia, Veria, Verina, Vi, Videl, Vienne, Vita, Wana, Xanthe, Xariah, Xiara, Xoey, Yalena, Yani, Yaremi, Ysela, Zala, Zarai, Zea, Zeanna, Zenya, Zoi, Zurii, Zynia, Antia, Ayris, Camy, Cataleia, Estellar, Ezella, Fauna, Ivry, Javaeh, Jozee, Kita, Kween, Lavaya, Lenya, Meiah, Melona, Miata, Miela, Mielle, Naz, Nyella, Nyna, Onya, Pama, Surie, Trixy, Abrea, Ahni, Ahnya, Aizel, Aleli, Aleska, Alle, Alveena, Alvita, Alyzae, Amaly, Amei, Ameli, Amicia, Anaka, Anda, Anikah, Annina, Anova, Anye, Araia, Araiah, Ardra, Areal, Ariday, Arita, Arlowe, Aroura, Arzoi, Asmi, Autumm, Aveena, Avonni, Ayira, Aylanni, Azalie, Azelea, Azlee, Baela, Basilia, Belky, Beola, Beza, Bia, Blia, Bona, Casha, Ceci, Cella, Ceria, Cerra, Charina, Chella, Chrysanthemum, Cici, Ciela, Cina, Corita, Dailah, Daisi, Daissy, Daisymae, Daizee, Datha, Dayzee, Deia, Deicy, Delsa, Delsy, Dianca, Dreyah, Ecko, Eimi, Eirene, Elenie, Elleri, Emika, Emony, Emora, Envi, Erine, Eriyah, Erleen, Eryss, Estie, Ezmay, Ezrie, Faline, Faya, Fergie, Fifi, Francy, Franny, Freyah, Frimmy, Gazella, Gem, Gera, Goldye, Gratia, Guila, Hailo, Happiness, Harleyquinn, Heela, Helem, Henya, Hypatia, Icey, Ikeya, Ilee, Indee, Indyah, Ineze, Irys, Ishi, Isys, Itha, Itzy, Ivi, Izela, Javia, Jemini, Jenova, Jezel, Jimma, Jora, Joyia, Julya, Kalya, Kamy, Katiya, Kayari, Kayia, Kehlanie, Kehlanii, Kenniya, Keomi, Kesa, Keta, Keyah, Khaia, Kida, Kiira, Kima, Kiora, Kiyona, Lalisa, Lany, Laurrie, Lavra, Leeloo, Leeona, Leidi, Lenia, Libra, Lien, Lile, Lille, Lilybelle, Lilyian, Linea, Linnell, Livana, Livvie, Liylah, Loda, Lowe, Loza, Lucee, Luciella, Luda, Lulabelle, Lun, Lunarae, Lunarose, Lyly, Lynia, Macaiah, Madolin, Mahli, Malay, Mally, Mane, Marchia, Marny, Marsia, Mati, Mayling, Mayve, Meeya, Meili, Memori, Miaa, Milian, Miniya, Minsa, Miski, Moni, Myan, Naiah, Nary, Navee, Naw, Nayvi, Nebula, Neira, Nelliel, Nera, Nesa, Nevia, Niari, Nimsi, Nini, Noheli, Novalea, Novaly, Nyala, Nyrie, Omi, Orean, Oriya, Ovi, Pascha, Patches, Peony, Perle, Petina, Phala, Piya, Placida, Prima, Quita, Raea, Raysa, Reata, Reeta, Reha, Reia, Remee, Remii, Reni, Reona, Rhaya, Rhina, Rini, Ritta, Riverly, Roda, Rodina, Romilly, Rosea, Rubyrose, Ryka, Saaya, Sady, Sanda, Sanye, Savaya, Savreen, Seela, Seleen, Seleni, Seoni, Sevi, Sherah, Shuna, Siennah, Sila, Siren, Skii, Skya, Skyrah, Solae, Soli, Solyana, Soni, Sonnia, Sosha, Starlee, Starlena, Starletta, Stela, Storii, Sugar, Summar, Sundai, Sunflower, Sya, Syan, Syla, Tallula, Tanai, Tanza, Taraya, Tasi, Tata, Thaila, Tija, Tippi, Tokyo, Ulanni, Uva, Vali, Valree, Veida, Veleka, Velina, Veona, Veora, Verita, Vetta, Veya, Via, Vicy, Vivie, Vivyan, Viya, Vylette, Vyolet, Winna, Winni, Winslet, Xalia, Xalori, Xana, Xoie, Yahvi, Yali, Yalina, Yelina, Zaeda, Zaidy, Zalea, Zanari, Zarra, Zeldy, Zelene, Zeni, Zeola, Zi, Zienna, Ziora, Zoa, Zoii, Zoua, Zurri, Zuzu, Zyia

Brothers: Milo, Felix, Ezra, Jasper, Mateo, Enzo, Theo, Alex, Augustus, Beau, Charlie, Dorian, Hugh, Jayce, Max, Ollie, Oscar, Otto, Rex, Vincent, Xander, Amare, Amias, Aries, Axle, Blaise, Bruno, Buster, Cal, Cass, Cyril, Desi, Dion, Ever, Fox, Gael, Golden, Hardy, Hugo, Jovani, Jules, Kylo, Lenny, Lucca, Maxim, Nico, Nino, Onyx, Orion, Orlando, Remy, Rey, Rico, Rio, Roby, Rocky, Sid, Sonny, Tedd, Tito, Toby, Vander, Vince, Anay, Anjel, Aris, Arno, Aslan, Aven, Bear, Bode, Cai, Coen, Dany, Demian, Elio, Geo, Gio, Giovonni, Jin, Juel, Kalel, Kam, Kamil, Kayvon, Khai, Koah, Koi, Kyro, Lev, Link, Lino, Loris, Luc, Lucious, Mathis, Mayer, Mayo, Micky, Mylo, Neko, Neo, Nery, Odie, Om, Otho, Ozzy, Ren, Roan, Ryver, Sacha, Tai, Taurus, Telly, Teo, Xavi, Xavior, Zeno, Ziggy, Acey, Ade, Adric, Aki, Alban, Albie, Altair, Alto, Amey, Andry, Anthon, Aquarius, Arias, Arlow, Arsen, Augie, Avante, Avel, Blase, Bodi, Caelum, Calem, Calib, Calix, Constant, Copper, Cordae, Corvin, Damein, Deno, Dex, Dom, Domani, Edi, Edy, Elex, Eon, Everet, Fitz, Gryffin, Gryphon, Hero, Hobie, Hoke, Ilo, Isidor, Ivis, Ivo, Jak, Ji, Jianni, Jj, Joss, Jovian, Kaio, Kao, Karmello, Kato, Kei, Keno, Khi, Ki, Leno, Liev, Lucah, Lukah, Lyon, Melo, Miloh, Monti, Myer, Neeko, Neiko, Neri, Nicco, Nilo, Olliver, Orlo, Orry, Paschal, Philo, Pier, Pius, Polo, Quest, Rai, Rainier, Ras, Real, Reco, Reo, Rigel, Roi, Ruffus, Sabin, Sagan, Shyne, Sirius, Strider, Sully, Sun, Sylis, Takari, Tavien, Tavius, Tidus, Toma, Tres, Tyus, Wil, Yanis, Yug, Zael, Zian, Zyire, Anival, Ario, Ariv, Ariz, Arles, Arth, Auggie, Aysen, Bawi, Beni, Benji, Benn, Bow, Brahm, Caillou, Casmir, Costa, Cyris, Czar, Dio, Ein, Escher, Eugen, Evo, Fredi, Fredis, Geddy, Hawke, Hemi, Iliya, Izen, Jayko, Jeno, Jese, Joon, Julez, Kaius, Kalik, Kano, Kanon, Kayo, Keo, Kino, Kiro, Lennin, Light, Lio, Lj, Luby, Lukis, Marinus, Marrio, Maxen, Maxi, Mayco, Meko, Mikhi, Miko, Min, Myheir, Mylez, Nieko, Nik, Nyko, Obi, Odyn, Ohm, Owynn, Pao, Phelix, Pio, Rafa, Remmy, Rhen, Ringo, Sael, Sony, Vian, Winn, Wirt, Xan, Yordy, Yuvin, Zai, Zavior, Zylo, Albi, Cas, Emrik, Gustin, Isador, Khalee, Khriz, Kyros, Leavy, Ruxin, Yeiren, Aari, Aaris, Aerion, Alby, Alyus, Amario, Amiris, Antino, Aro, Arty, Asan, Asaya, Baer, Balen, Barlow, Bengie, Benno, Cavani, Chao, Chino, Cosby, Dhani, Donat, Eddi, Ekko, Elean, Eljay, Elo, Emerik, Emett, Endi, Eze, Felis, Gatsby, Gor, Hairo, Han, Hershey, Iniko, Inri, Isandro, Jaja, Jas, Jekhi, Jhayco, Joa, Julias, Kaido, Kalo, Karo, Khye, Kilo, Kire, Kito, Kovi, Kyi, Kyrus, Lavin, Leny, Louka, Lowen, Lui, Luv, Macio, Mareo, Math, Mazzi, Meeko, Mega, Michi, Mir, Mory, Nasai, Neco, Neer, Ness, Nio, Noar, Nyan, Nylo, Ohn, Oli, Olly, Ondre, Onyxx, Ozil, Prish, Ralphie, Robben, Rocko, Rolen, Samba, Silvan, Simba, Taika, Talis, Tallis, Tavio, Thanos, Tiam, Toa, Ulys, Vivin, Weber, Wilde, Yeico, Yunay, Zaion, Zavi, Zeon, Zeph, Zoel, Zuma

Names like Leo

Names whose popularity has moved with Leo's over the last 50 years.

A parent animal hugging its little one, the personalized name page

L is for Leo, our favorite little boy.

L is for Leo…”

In a Mallowby alphabet book, Leo's letter becomes Leo's page: hand-illustrated, printed hardcover or paperback, made just for them.

Make Leo's book

Books for siblings or grandkids? The second book is 15% off.

Questions parents ask

What does Leo mean?
"Lion", it is the Latin word itself, cognate with Greek leōn, used as a personal name since Roman times.
How popular is Leo?
Leo ranked No. 19 for American boys in 2025, given to about 1 in every 209 boys, and has been rising since 1989.
Is Leo short for another name?
It can stand alone, and most American Leos today are just Leo, but it also serves as a short form of Leonard, Leopold, Leonardo, and as the English form of Lev.
When was Leo most popular before now?
Its earlier American peak came in 1903, during the immigrant-era fondness for compact classic names; today's usage is a full revival of that vintage.
What sibling names pair well with Leo?
Ivy, Stella, or Cora for a sister; Milo, Felix, or Mateo for a brother.