Guillermo
Spanish form of William, from the Germanic Willahelm, which joins wil, "will, desire," with helm, "helmet" or "protection."
Guillermo in 2025
Guillermo was given to 264 babies in the United States in 2025, making it the 1,849th most popular name of the year. That is roughly one in every 12,558 babies born.
The history of Guillermo
Guillermo reached its highest point in 1998, when 693 babies were given the name, ranking 762nd that year. Its best-ever ranking was 730th, in 1994.
Across the 141 years of records since 1885, 32,148 babies have been named Guillermo. Half of them were born before 1993, which places the name's centre of gravity with Millennials.
Guillermo by decade
| Decade | Babies named Guillermo | Best rank |
|---|---|---|
| 1880s | 5 | 1,987 |
| 1890s | 13 | 1,840 |
| 1900s | 44 | 1,876 |
| 1910s | 253 | 2,075 |
| 1920s | 821 | 1,274 |
| 1930s | 783 | 1,220 |
| 1940s | 943 | 1,260 |
| 1950s | 1,495 | 1,297 |
| 1960s | 2,112 | 989 |
| 1970s | 3,362 | 897 |
| 1980s | 4,388 | 827 |
| 1990s | 6,496 | 730 |
| 2000s | 6,100 | 820 |
| 2010s | 3,615 | 1,199 |
| 2020s | 1,718 | 1,684 |
Where Guillermo is heading
Guillermo has fallen 32% over the past decade, from 389 babies in 2015 to 264 in 2025.
Names like Guillermo
Names that rose and fell at the same time as Guillermo.