Declining since 1997, #901 for boys today.
Popularity of Guillermo since 1885
Babies named Guillermo per year in U.S. Social Security records.
Data table (by decade)
| Decade | Boys |
|---|---|
| 1880s | 5 |
| 1890s | 13 |
| 1900s | 44 |
| 1910s | 253 |
| 1920s | 821 |
| 1930s | 783 |
| 1940s | 943 |
| 1950s | 1,495 |
| 1960s | 2,107 |
| 1970s | 3,357 |
| 1980s | 4,363 |
| 1990s | 6,462 |
| 2000s | 6,095 |
| 2010s | 3,615 |
| 2020s | 1,718 |
Meaning & origin
Guillermo has been a consistent presence in U.S. naming since at least 1885, but its popularity has seen a notable decline since its peak in 1996, when it ranked much higher. As of 2025, the name sits at rank 901, with about 1 in 6,470 boys receiving the name each year. This trajectory shows a falling trend since 1997, reflecting broader shifts in naming preferences. Geographically, Guillermo is most popular in states with large Hispanic populations, including Arizona, Nevada, and Texas. Despite the decline, Guillermo remains a strong cultural touchstone within Spanish-speaking communities, offering a classic alternative with deep historical roots.
Guillermo is the Spanish form of William, derived from the Old High German 'Willahelm', from 'willio' (will, desire) and 'helm' (helmet, protection). The name was introduced to Spain by the Visigoths and has been in use since the Middle Ages. It remains a classic Spanish name, particularly common in Latin America and among Spanish-speaking communities in the United States.
Where Guillermo 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.
Nicknames & variants
Nicknames: Guille, Memo, Lermo
Sibling names for Guillermo
Names that share Guillermo's style, for a brother or sister.
Names like Guillermo
Names whose popularity has moved with Guillermo's over the last 50 years.
