Given name & surname

Ildefonso

“noble”·“ready for battle”

Ildefonso is a surname from Spanish. It is used in English, Spanish, Italian, and Portuguese.

Meaning & origin

What it means

Ildefonso is built from elements meaning “noble” and “ready for battle”.

Adapted from Wiktionary (CC BY-SA 4.0)

Where it comes from

Ildefonso comes from Spanish.

Adapted from Wiktionary (CC BY-SA 4.0)

How it developed

From Gothic Athalfuns.

Adapted from Wiktionary (CC BY-SA 4.0)

The story

Published U.S. birth records include this spelling as early as 1917. This is the earliest published observation available here, rather than a date for the name’s origin.

From dated birth records

Ildefonso through the years

Babies since 1880
392
392 boys · 0 girls
Most popular year
1976
16 babies
2025
0
Outside the ranked list
2021–25 vs 2016–20
—
Too few births to compare
051015192019401960198020002025Highest share 19760.0
Ildefonso in U.S. Social Security birth records, 1917–2025, per million boys born. Years with fewer than five births for a sex are not published and appear as zero. Use the arrow keys to step through years.

By the numbers

The most recent published U.S. birth count for boys is 5 in 2022. Later missing counts do not mean the name went unused. Its largest published annual count for boys was 16 in 1976. Published U.S. population figures for this spelling include 1,457 as a first name in 2020; 680 as a surname in 2020.

From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.

Ildefonso’s family of names

In Spanish usage, Ildefonso has a conventional equivalent in the Polish form ILDEFONS.

Walk Ildefonso’s family in the name graph

IldefonsoAlfonsoAdelfoIldefonzoIldelfonsoIldephonseIldefonsIldefonseIldefonsusIldephonsus

The ring: across languages.

Hover or tab through the constellation to see how each name is related. Bigger dots are names more people in the U.S. share.

Across languages 9

Equivalents and cognates in other languages, plus older forms it grew from.

Show 1 moreShow fewer

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Sibling ideas

Names that share Ildefonso’s feel without repeating its first letter or rhyming with it.

A brother for Ildefonso

A sister for Ildefonso