Gillermo
Masculine · “A spelling of Guillermo”
Gillermo is Guillermo, the Spanish William, written without its u, and it is the name two very different immigrants took on arriving in Latin America: a German photographer who became Frida Kahlo's father, and an Irish sailor who became Argentina's first admiral.
How old is the name Gillermo?
Gillermo first appears in US birth records in 1922 — 103 years ago. The typical Gillermo alive today was born around 1977, making them about 48 years old. About 500 people named Gillermo are estimated to be alive in the US today.
When was the name Gillermo most popular?
Gillermo peaked in 1972, reaching #2158 nationally. See the whole 1972 chart.
Where it comes from
From Willahelm to Gillermo
The story of Gillermo
Carl Wilhelm Kahlo, born in Germany, emigrated to Mexico in 1891 and became Guillermo Kahlo, a photographer of architecture and the father of the painter Frida Kahlo. Earlier in the century William Brown, born in County Mayo, went to sea, settled in Buenos Aires and, as Guillermo Brown, commanded the new Argentine navy in the war of independence and the wars that followed; Argentina counts him as the father of its navy. Gillermo is a spelling of the same Spanish name, written as it sounds.
Meaning
A spelling of Guillermo, the Spanish William, 'resolute protector'
William joins the Germanic words for 'will, desire' and 'helmet, protection'. Spanish writes it Guillermo, with a u that keeps the g hard; Gillermo drops it.
How the name formed
- Willahelm
- Guillaume
- Guillermo
- Gillermo
Related forms: Guillermo · William · Wilhelm · Guillaume · Guglielmo
Pronouncing Gillermo
gee-YAIR-moh
Three syllables with the stress on the second, as in Guillermo.
Nicknames for Gillermo
Moderate
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 1922
- Most boys named
- 199321 — the highest on record
- Peak rank
- #2158reached in 1972
- Change vs 2009
- 0.0%5 in 2011, from 5
Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.
Gillermo in other languages
The same name elsewhere
- Guillermo in Spanish — spelling variant
- William in English — same name
- Wilhelm in German — same name
- Guillaume in French — same name
- Guglielmo in Italian — same name
Gillermos among us
people named Gillermo are estimated to be alive in the US today
Estimated from SSA birth records and published actuarial life tables. Method
Is it right for you
Questions parents actually ask
Fashion outlook
Gillermo sits outside the current charts, and that is its own kind of answer: naming cycles can only date the names they carried up. A name this rare has no decade stamped on it — it cannot go out of fashion, because it was never in.
Based on 146 years of naming cycles. How we read them
The trade-off
- Sounds exactly like Guillermo, a name known across the Spanish-speaking world.
- The same name as William, one of the most widely used names in Europe.
- Comes with Memo as a well-worn short form.
- Without the u, English readers may say JIL-er-moh; Spanish readers may expect the u.
- Guillermo is the standard spelling, so this one will be corrected.
- It will need spelling out on every form.
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What they receive
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Gillermo
Masculine
Frequently asked
- How many Gillermos are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 500 people named Gillermo are estimated to be alive in the US today.
- How popular is the name Gillermo in 2025?
- Gillermo is rarely given in the US today — it does not rank in the top 2000 boy names.
- Will my child share the name Gillermo with classmates?
- Gillermo will almost certainly be the only one in school.
More G names
The most-given names starting with G, all years combined.
George#126 · Gary#1073 · Gregory#593 · Gerald#1204 · Gabriel#37 · Glenn#1443 · Gavin#303 · Gordon#1051
Looking for what else is popular rather than what resembles Gillermo? See the current top 100.
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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