MallowbyNames

Mitsuo

三夫MIT-soo-oh · bright man, third son, or light

Peak popularity
1925
Usually for
Boys
Trend
Holding steady

Holding steady.

Popularity of Mitsuo since 1912

Babies named Mitsuo per year in U.S. Social Security records.

132740192019602000Most births 1925Boys
Data table (by decade)
DecadeBoys
1910s124
1920s321
1930s71
1940s5
1950s0
1960s0
1970s0
1980s0
1990s0
2000s0
2010s0
2020s0

Meaning & origin

Mitsuo is a traditional Japanese name that saw its highest usage in the United States during the 1920s, peaking in 1925. Although it has never ranked among the top names nationally, it reflects a period of increased Japanese immigration and cultural presence. The name's trajectory has been stable in recent decades, maintaining a small but consistent presence. Its meaning depends on the kanji selection, offering interpretations such as 'third son' or 'light.' Parents today choosing Mitsuo may appreciate its connection to Japanese heritage and its distinctive sound.

Mitsuo is a Japanese masculine name formed from various kanji combinations. The first element 'mitsu' can mean 'light' (光), 'third' (三), or 'full' (満), while 'o' (夫, 男, 雄) means 'husband,' 'man,' or 'male.' The name has been in use since at least the early 20th century in Japan, with peak popularity in the 1920s.

Nicknames & variants

Nicknames: Mitsu, Mi-chan

Variants: Mitsuwo, Mitsuhiko

Sibling names for Mitsuo

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

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

M is for Mitsuo, our favorite little boy.

M is for Mitsuo…”

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

Make Mitsuo's book

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

Questions parents ask

What does the name Mitsuo mean?
Mitsuo is a Japanese name that can mean 'bright man' or 'third son' depending on the kanji used. It combines elements meaning 'light' or 'third' with 'man' or 'male.'
How popular is the name Mitsuo?
According to U.S. Social Security data, Mitsuo peaked in popularity in 1925 but has since declined significantly. As of 2025, it is not ranked among the top names.
Is Mitsuo a boy or girl name?
Mitsuo is traditionally a masculine name in Japan.