Boys' name · since 1917
Ildefonso
392 babies named Ildefonso in U.S. Social Security records since 1917, with the highest year being 1976. Year-by-year trend, decade aggregates, and state-level rankings drawn from federal birth data.
- #9,130 of 45,481
- all-time among boys
- 392
- born since 1917
- 1980s
- peak decade
Ildefonso is not among the current top-ranked boys names; 392 have been recorded since 1917.
According to the U.S. Social Security Administration, Ildefonso has been recorded 392 times among boys since 1917, though it is not among the currently most-used boys names, with its heaviest use in the 1980s. This profile covers year-by-year birth trends, decade totals, and state-level distribution, all derived directly from SSA birth-registration files spanning 1917 to 2022.
- #9,130 of 45,481 all-time among boys
- 392 born since 1917
- 1980s peak decade
Data updated Aug 2026
The verdict
According to the U.S. Social Security Administration, Ildefonso ranks #9,130 of 45,481 boys' names by all-time recorded births (highest first). 392 born since 1917, peaking in the 1980s.
- #9,130 of 45,481
- all-time among boys
- 392
- born since 1917
- 1980s
- peak decade
Ildefonso's 392 recorded births place it above 79.9% of the 45,481 boys names in the full SSA archive.
The state file records this name in 2 jurisdictions, led by Texas.
Ildefonso's usage pattern, beyond the headline number
Ildefonso splits its recorded history at 1978: 49% of all births land in the more recent half, 51% in the earlier half, an evenly balanced pattern over time. The single quietest year was 1940 (5 births) -- compare that against the 1976 peak of 16 for a sense of just how much the name's popularity has swung.
Ildefonso popularity over time
Annual U.S. births registered with the Social Security Administration · 1917–2022
- Peak year (1976)
- 16
- Annual births at peak, across 106 years of records
Ildefonso by decade
1980s is the heaviest window (76 births, 19% of the file).
1980s was Ildefonso's strongest decade.
76 babies received the name during that ten-year window, about 19% of all-time use.
Ildefonso births by decade
Total births in each ten-year window
- 1910s 6
1910s
6 births
- 1920s 12
1920s
12 births
- 1930s 6
1930s
6 births
- 1940s 30
1940s
30 births
- 1950s 24
1950s
24 births
- 1960s
1960s
69 births
- 1970s
1970s
67 births
- 1980s
1980s
76 births
- 1990s
1990s
58 births
- 2000s
2000s
34 births
- 2010s 5
2010s
5 births
- 2020s 5
2020s
5 births
What this shows Peak: 1980s at 76 births (19% of all-time use).
Ildefonso by state
Where Ildefonso concentrates geographically, total births since 1917
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | Texas | | 30 | 7.7% |
| #2 | California | | 11 | 2.8% |
30 of 392 births nationwide. Compared to a flat distribution across 2 reporting states.
Frequently Asked Questions
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Where does Ildefonso sit in the SSA name archive? ▼
When was Ildefonso most popular? ▼
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How long has the name Ildefonso been used? ▼
What to do with Ildefonso's data
- Ildefonso's decade-level peak was the 1980s (76 total births); usage has since declined to 5 in the 2020s -- if you're weighing a "classic revival" angle, the trend line argues against it.
- Texas records the most Ildefonsos (30 births) -- see the full state breakdown if geography matters to your decision. Texas names
Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.
Keep exploring Ildefonso
Related Names
Names with a similar number of total births
Nationwide names with similar peak year or record span
Two nationwide peer axes for Ildefonso: closest SSA peak year, and closest first→latest record span. Distinct from the spelling and current-rank neighborhoods above.
Similar peak year (~1976)
Similar record span (~105 yrs)
Peak year is the single SSA year with the most births for that name; record span is first-to-latest year in the national files, not a recommendation or shared origin claim.
Data Sources
Data as of August 2026. Source: U.S. Social Security Administration (SSA).
According to the Social Security Administration, this profile draws directly from the agency's public-use baby-name files (updated June 2026). See our methodology for the full extraction, aggregation, and privacy-suppression rules.
Primary: Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications, National Data, 1917–2022 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Name Almanac is rendered directly from the Social Security Administration's public baby-name files, no number is typed in by an editor. This profile for Ildefonso draws directly on SSA national and state-level files, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.