Guillermo Boy
How popular is Guillermo?
#901 boy name in 2025
264 baby boys were named Guillermo in the US in 2025, making it the 901st most popular boy name.
28,225living people named Guillermo (est.)
31median age of people named Guillermo
32,148babies named Guillermo since 1880
1 in 12,558US babies born in 2025
Guillermo popularity over time
Boys Girls
| Rank in 2025 | #901 for boys (▼ 70 from 2024) |
|---|---|
| Babies in 2025 | 264 boys |
| 10-year trend | Falling (-32% babies vs 2015) |
| Earlier ranks | #661 in 2015, #832 in 2020 |
| Peak year | 1998 (693 boys) |
| Highest rank | #352 in 1996 |
| First recorded | 1885 |
| Boys vs girls (last 10 years) | 100% boys, 0% girls |
| Chance a classmate shares it | 0.2% in a class of 25 kids born in 2025 |
Where Guillermo is most popular
Babies named Guillermo per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFL
- Arizona: 0.5 per 1,000 (74 boys)
- Texas: 0.4 per 1,000 (382 boys)
- California: 0.4 per 1,000 (363 boys)
- Nevada: 0.2 per 1,000 (14 boys)
- Colorado: 0.2 per 1,000 (27 boys)
Guillermo by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1880s | 5 | #935 |
| 1890s | 13 | #791 |
| 1900s | 44 | #760 |
| 1910s | 253 | #859 |
| 1920s | 821 | #605 |
| 1930s | 783 | #584 |
| 1940s | 943 | #571 |
| 1950s | 1,495 | #579 |
| 1960s | 2,107 | #449 |
| 1970s | 3,357 | #400 |
| 1980s | 4,363 | #385 |
| 1990s | 6,462 | #352 |
| 2000s | 6,095 | #391 |
| 2010s | 3,615 | #553 |
| 2020s | 1,718 | #811 |
Boy names about as popular as Guillermo
Questions
- Is Guillermo a boy or girl name?
- Guillermo is mostly a boy name. Over the last 10 years, 100% of babies named Guillermo were boys.
- How popular is the name Guillermo?
- 264 baby boys were named Guillermo in the US in 2025, making it the 901st most popular boy name.
- When was Guillermo most popular?
- Guillermo peaked in 1998, when 693 boys were given the name. Its highest rank was #352 in 1996.
- How many people are named Guillermo?
- 32,148 babies have been named Guillermo in the US since 1880. We estimate about 28,225 of them are alive in 2026, with a median age of 31.
- Where is Guillermo most popular?
- From 2021 to 2025, Guillermo was most common in Arizona, at 0.5 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.