Guillermo is a boy name with a modern feel, drawn from real birth records. Below you'll find what Guillermo means and where it comes from, plus how many babies have been named Guillermo across the United States, UK, Ireland and New Zealand, how popular Guillermo has been over the decades, and the year it peaked.
Guillermo is a boy name of Germanic origin meaning “resolute protector”. The Spanish form of William.
| Country | Births on record |
|---|---|
| United States since 1880 | 32,148 births |
| England & Wales since 1996 | 52 births |
Counts come from official national birth-registration statistics: U.S. Social Security Administration, England & Wales (Office for National Statistics), Scotland (National Records of Scotland), Northern Ireland (NISRA), Ireland (Central Statistics Office) and New Zealand (Dept. of Internal Affairs). Coverage spans differ, so totals aren't directly comparable across countries.
Babies named Guillermo per year, United States (1885 to 2025). United States peaked in 1998 (693/yr) · England & Wales peaked in 2019 (8/yr).
Guillermo has been a fairly common baby name in the United States. It was most common in 1998, when it ranked #762 nationally (given to 693 babies that year).
Guillerma · Guilherme · Gillermo · Gullermo
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