Guillermo
Boy name · #902 in 2025 · Uniqueness 63/100
Guillermo ranks #902 among American boys' names as of 2025, with 264 newborns given the name that year. A decade ago it stood at #661, so the name has been falling over the past ten years. Roughly one in every 6,818 boys born in 2025 was named Guillermo.
Babies named Guillermo per year, 1880–2025. Source: SSA.
The 140-year story
Guillermo first appears in the Social Security records in 1885, when 5 boys received the name. Its peak came in 1998, when 693 boys were named Guillermo — good for #369 that year. Today's parents encounter it on its way down the popularity curve, which for many parents is exactly the appeal. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Unlock the 5-year forecast and compare Guillermo against up to 5 other names.
Uniqueness: will there be another Guillermo in class?
Guillermo scores 63 out of 100 on our uniqueness scale, which blends current rarity with five-year momentum — putting it in the "distinctive" band. That middle band is the sweet spot many parents hunt for: recognizable without being everywhere.
Where Guillermo is most common
Geography matters for names, and Guillermo is no exception. In 2025 the states with the most Guillermos were TX (64), CA (60), AZ (17), FL (11), WA (10). Raw counts naturally favor populous states, but the spread still hints at where the name is part of the local naming culture.
Names like Guillermo
Statistically, parents drawn to Guillermo tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Gerardo, Gustavo, Gonzalo, Gilberto, and Ernesto.
GerardoGustavoGonzaloGilbertoErnestoAlfredoBernardoAlberto
Rank history (last 25 years)
| Year | Babies named Guillermo | Rank |
|---|---|---|
| 2025 | 264 | #901 |
| 2024 | 299 | #831 |
| 2023 | 294 | #833 |
| 2022 | 287 | #848 |
| 2021 | 299 | #811 |
| 2020 | 275 | #832 |
| 2019 | 320 | #747 |
| 2018 | 314 | #751 |
| 2017 | 289 | #795 |
| 2016 | 322 | #754 |
| 2015 | 389 | #661 |
| 2014 | 376 | #676 |
| 2013 | 348 | #688 |
| 2012 | 392 | #619 |
| 2011 | 408 | #604 |
| 2010 | 457 | #553 |
| 2009 | 534 | #507 |
| 2008 | 583 | #476 |
| 2007 | 610 | #454 |
| 2006 | 621 | #439 |
| 2005 | 616 | #434 |
| 2004 | 639 | #406 |
| 2003 | 595 | #428 |
| 2002 | 626 | #404 |
| 2001 | 620 | #402 |
Frequently asked questions
Is Guillermo a popular boy name?
Guillermo ranked #902 among boys in 2025 with 264 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #661.
When was the name Guillermo most popular?
Guillermo peaked in 1998, when 693 American boys received the name (ranked #369 that year). Since 1998 the name has declined from that high.
How rare is the name Guillermo?
In 2025, roughly 1 in 6,818 newborn American boys was named Guillermo. It scores 63/100 on our uniqueness scale (rarity blended with momentum), which we classify as "distinctive".
Data source: U.S. Social Security Administration name statistics, 1880–2025, national and state files. Counts reflect Social Security card applications; names with fewer than 5 occurrences in a state-year are suppressed by the SSA.