Isidor

#10,079 in 2025Boys' name

Form of Isidore

Isidor has been given to 419 babies in the U.S. since 1883. In 2025 it ranked #10,079 of 13,926 boys’ names in use. Its peak year was 1914, with 24 recorded.

Babies named Isidor, 2025

1 in 474,000

Isidor over time, 1880–2025

Boys

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Isidor: meaning, origin, and history

Form of Isidore

Deeper origin not confirmed in the cited records

What Isidor means

Isidor is a form of Isidore.

Meaning behind the documented name family

The name developed through Isidor → Isidore. The family’s meaning is “gift of (the goddess) Isis”, recorded in English.

Origin, language, and formation

Isidor is used in Old Czech.

Related names and everyday forms

Related names include Isidore.

Pronunciation and spelling

In Old Czech, Isidor is pronounced /ˈisidor/.

American usage and historical context

In the United States, 419 boys were recorded with the name Isidor between 1883 and 2025. Its highest annual count was 24 in 1914; its best national rank was #802 in 1885.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Isidor?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025: 1 in 474,000; 7 of 3,315,165 births
Among boys only: 1 in 244,000; <0.01% of boys
Rank, 2025: #10,079; of 13,926 boys’ names in use
Coin-flip room size: 328,272 kids; Even odds of a second one

Where Isidor sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%

Class of 30Under 1%

Grade of 100Under 1%

School of 500Under 1%

Put another way: gather 328,272 children born in 2025 and it's an even bet that one of them is another Isidor. In a class of 30 the chance is Under 1%.

When Isidors were born

Half of everyone ever recorded as Isidor was born before 1918 — so the typical Isidor is around 107 today.

Median birth year: 1918; About 107 years old
Biggest decade: 1910s; 38.2% of all use
Born in the last 25 years: 8.4%; Mostly a past generation
Recorded since 1950: 74; People you could plausibly meet

Choose a decade

1910s — 38.2% of all recorded uses (160).

Is Isidor rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago: −737; Places dropped
Rank vs 5 years ago: New entry; Not ranked then
Rank vs 10 years ago: —; Not ranked then
Births vs 10 years ago: —; Not published both years
Share of its own peak: 29.2%; Peak was 1914 (24)
Years since peak: 111; Years
Year-to-year steadiness: Shifting; 24.3% average annual change
Best rank ever: #802; 1885

Spellings of Isidor

Isidor is not the most common spelling — Isidro is, with 43.1% against Isidor's 2.2%.

Isidro43.1%8,211
Isadore30.0%5,714
Isidore18.0%3,421
Isidoro6.8%1,292
Isidor2.2%419

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Isidor is used

Across 1910–2025, Isidor was most concentrated in New York — about 1 in 100,000 boys, against 1 in 137,359 across all states with data.

11 per 100,000

State popularity map

Most concentrated

1New York1 in 100,000

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Isidor has too little recent state data to map, so this covers all years from 1910.

Isidor around the world

Where Isidor ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

France
1900–2025
#5,468
in 2025

Popularity data from Institut national de la statistique et des études économiques. INSEE data under Licence Ouverte / Etalab 2.0.

Isidor by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025: #10,079
Trend vs 5 yrs ago: New entry
Best rank ever: #802; 1885
Peak year: 1914; 24 that year
First recorded: 1883
Last recorded: 2025
All-time count: 419
Count in 2025: 7

Names similar to Isidor

Matched on shared beginnings and endings, similar length, and comparable popularity.

Teodor Isiaha Isiaih Avigdor Fyodor Isiac Isidore Isidro Fedor Isidoro Isiaah Sandor Isias Isador Amador Eldor Theodor Tudor Isileli Salbador Isiah Theador Andor Aldor

Sibling names for Isidor

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

For a sister

Albina Lauretta Lida Garnet Alpha Harriette Maudie Leta

For a brother

Winfield Waldo Regis Gustave Lyman Alva Granville Trinidad

Explore around Isidor

Top names of 1914, Isidor's peak year The 1910s in full Other names that peaked in 1885 Boys' names starting with I