Ildefonso
Masculine
Ildefonso entered the US charts in 1917, peaked at #2403 in 1946, is rarely given in 2025 — given to only a few children a year.
How old is the name Ildefonso?
Ildefonso first appears in US birth records in 1917 — 108 years ago. The typical Ildefonso alive today was born around 1976, making them about 49 years old. About 300 people named Ildefonso are estimated to be alive in the US today.
When was the name Ildefonso most popular?
Ildefonso peaked in 1946, reaching #2403 nationally. See the whole 1946 chart.
Lists built from the same records:
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
- 1917
- Most boys named
- 197616 — the highest on record
- Peak rank
- #2403reached in 1946
- Change vs 2011
- 0.0%5 in 2022, 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.
Ildefonsos among us
people named Ildefonso 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
Ildefonso 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
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Ildefonso
Masculine
Frequently asked
- How many Ildefonsos are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 300 people named Ildefonso are estimated to be alive in the US today.
- How popular is the name Ildefonso in 2025?
- Ildefonso is rarely given in the US today — it does not rank in the top 2000 boy names.
- Will my child share the name Ildefonso with classmates?
- Ildefonso will almost certainly be the only one in school.
More I names
The most-given names starting with I, all years combined.
Isaac#47 · Ian#83 · Isaiah#57 · Ivan#162 · Israel#315 · Ira#819 · Irving#1778 · Ismael#263
Looking for what else is popular rather than what resembles Ildefonso? See the current top 100.
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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