Ildefonso: Name Popularity, History & Rankings (1880

Rank 2025

–

among boys

Babies in 2025

named Ildefonso

How common

–

boys born in 2025

Peak year

1976

16 babies

All-time total

392

#9,129 all-time among boys

First recorded

1917

in Social Security records

Ildefonso popularity over time

392 babies have been named Ildefonso since 1917, according to official Social Security records. Switch measure to see births per year or the yearly rank.

Measure

Births per 1,000 babies of that sex, comparable across eras

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade	Boys	Per year	Change	Best rank
1880s	–	–	–	–
1890s	–	–	–	–
1900s	–	–	–	–
1910s	6	1	–	#3,747
1920s	12	1	+100%	#3,919
1930s	6	1	-50%	#3,576
1940s	30	3	+400%	#2,474
1950s	24	2	-20%	#2,520
1960s	69	7	+188%	#2,701
1970s	67	7	-3%	#2,646
1980s	76	8	+13%	#3,495
1990s	58	6	-24%	#5,016
2000s	34	3	-41%	#9,024
2010s	5	1	-85%	#13,038
2020s (to 2025)	5	1	+67%	#13,074

The story of Ildefonso

Ildefonso is not currently in use for newborns in the United States: fewer than five babies received the name in 2025. Its story lives in the historical record below.

Since 1917, 392 American babies have been named Ildefonso. Its peak came in 1976, when 16 newborns received the name, the signature sound of the 1970s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Ildefonso stood among all boys' names in any year, or use the compare tool to plot it against other names.

How old are people named Ildefonso?

The median living Ildefonso is about 44 years old; half are between 32 and 58. An estimated 300 people named Ildefonso are alive in the United States today.

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Ildefonso year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year	Boys	Boys rank
2025	–	–
2024	–	–
2023	–	–
2022	5	#13,074
2021	–	–
2020	–	–
2019	–	–
2018	–	–
2017	–	–
2016	–	–
2015	–	–
2014	–	–
2013	–	–
2012	–	–
2011	5	#13,038
2010	–	–
2009	–	–
2008	5	#13,283
2007	–	–
2006	6	#11,167
2005	5	#12,108
2004	5	#12,033
2003	7	#9,024
2002	–	–
2001	6	#9,725
2000	–	–
1995	–	–
1990	7	#6,709
1985	8	#4,870
1980	5	#6,645
1975	8	#4,094
1970	5	#5,032
1965	6	#3,696
1960	8	#3,195
1955	–	–
1950	–	–
1945	–	–
1940	5	#3,682
1935	–	–
1930	–	–
1925	–	–
1920	–	–
1915	–	–
1910	–	–
1905	–	–
1900	–	–
1895	–	–
1890	–	–
1885	–	–
1880	–	–

Famous people named Ildefonso

The most globally famous bearers of the name, ranked by fame across Wikipedia editions (Pantheon project, MIT).

1 Ildefonso Falcones Spanish lawyer and writer b. 1959 · Contemporary

Portraits from Wikipedia (Wikimedia Commons).

Frequently asked questions

Quick answers about Ildefonso, drawn from the same Social Security data as the charts above.

How old is the average Ildefonso?

The median living Ildefonso is about 44 years old. Half of all living Ildefonsos are between 32 and 58 years old.

How many people named Ildefonso are alive today?

An estimated 300 people named Ildefonso are alive in the United States, based on 392 recorded births and Social Security life tables.

What does the name Ildefonso mean?

Ildefonso (Ildefonsus) is a Spanish given name, ultimately from Gothic Hildefuns, the name of 7th-century saint and archbishop Ildephonsus.

How popular is the name Ildefonso in 2025?

Ildefonso did not appear in the 2025 Social Security data, which means fewer than five babies received the name that year.

How many people are named Ildefonso?

392 babies have been named Ildefonso in the United States since 1917, based on Social Security card applications.

When was the name Ildefonso most popular?

Ildefonso peaked in 1976, when 16 newborns received the name.

Is Ildefonso a boy or girl name?

Ildefonso is overwhelmingly a boy's name: 100% of babies with the name.

Is the name Ildefonso rising or falling?

Ildefonso has been roughly stable over the past decade.

Who are famous people named Ildefonso?

Well-known people named Ildefonso include Ildefonso Falcones (writer).

Names like Ildefonso

Names that sound and feel close to Ildefonso: shared sounds, similar era, similar popularity. Each links to its full history.

Compare Ildefonso with similar names → More names starting with I →