Total births
392
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.
- 392
- total births
- 1917–2022
- years on record
- 1980s
- peak decade
- 19%
- born in that 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.
- 392 total births
- 1917–2022 years on record
- 1980s peak decade
- 19% born in that decade
Data updated Jul 2026
The verdict
392 boys have been named Ildefonso since 1917, peaking in the 1980s, last recorded in 2022.
- 392
- total births
- 1917–2022
- years on record
- 1980s
- peak decade
- 19%
- born in that decade
1980s
Peak decade
19% of everyone ever named Ildefonso was born in this single decade.
1976
Single peak year
16 babies were named Ildefonso in 1976 - its busiest year on record.
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 at a glance
Last recorded 2022Peak year
1976
Current rank
Unranked
Active since
1917
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
Total births in each ten-year window, peak vs trough at a glance
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% |
Texas share of Ildefonso's total US births 7.7%
Even split
30 of 392 births nationwide. Compared to a flat distribution across 2 reporting states.
Frequently Asked Questions
How popular is the name Ildefonso? ▼
392 babies have been named Ildefonso since 1917. It was last recorded in 2022. The peak year was 1976 with 16 births.
When was Ildefonso most popular? ▼
Ildefonso was most popular in the 1980s decade with 76 total births. The single peak year was 1976.
Where is Ildefonso most popular? ▼
The top states for the name Ildefonso are Texas (30 births), California (11 births).
How long has the name Ildefonso been used? ▼
Ildefonso has been recorded in Social Security data since 1917, spanning 106 years of data through 2022.
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
- Weighing it against an alternative? Put two names side by side. Compare 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
Data Sources
Data as of July 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).
Cite this page
NameAlmanac Editorial. "Ildefonso: Baby Name Since 1917 - 392 Births, Peak 1976." NameAlmanac. Accessed via https://namealmanac.com/name/ildefonso. Licensed CC BY-SA 4.0.
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 July 2026.