Isidor
Isidor was given to 7 boys in 2025, #10,079 among boys’ names; 419 Americans have been recorded with it since 1883 (Social Security Administration, published May 2026).
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Isidor by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
How popular is Isidor?
#10,079 among boys’ names, 2025
Isidor entered the boys’ rankings after 2015 and stood at #10,079 in 2025.
24 babies in 1914, the peak
Isidor peaked in 1914, when 24 boys were given it, #1,207 among boys’ names. The 7 births of 2025 are 29% of that peak.
| Year | Births | Rank | Per million boys |
|---|---|---|---|
| 2025 | 7 | #10,079 | 4.1 |
| 2024 | 8 | #9,342 | 4.6 |
| 2023 | 15 | #6,039 | 8.8 |
| 2018 | 5 | #12,921 | 2.8 |
| 1961 | 6 | #3,813 | 2.8 |
| 1958 | 6 | #3,705 | 2.8 |
| 1955 | 7 | #3,324 | 3.4 |
| 1954 | 8 | #3,050 | 3.9 |
| 1951 | 7 | #3,202 | 3.7 |
| 1950 | 5 | #3,921 | 2.8 |
Every recorded year (46)
| Year | Births | Rank | Per million boys |
|---|---|---|---|
| 1947 | 6 | #3,526 | 3.3 |
| 1938 | 5 | #3,764 | 4.5 |
| 1937 | 6 | #3,321 | 5.6 |
| 1936 | 5 | #3,790 | 4.8 |
| 1932 | 9 | #2,733 | 8.6 |
| 1931 | 6 | #3,577 | 5.8 |
| 1930 | 5 | #4,259 | 4.6 |
| 1929 | 5 | #4,259 | 4.6 |
| 1927 | 7 | #3,623 | 6.2 |
| 1925 | 11 | #2,662 | 9.9 |
| 1923 | 9 | #3,058 | 8.2 |
| 1922 | 9 | #3,125 | 8.3 |
| 1921 | 10 | #2,886 | 9.1 |
| 1920 | 16 | #2,087 | 15.0 |
| 1919 | 10 | #2,775 | 10.2 |
| 1918 | 19 | #1,791 | 18.7 |
| 1917 | 17 | #1,861 | 18.4 |
| 1916 | 20 | #1,618 | 22.5 |
| 1915 | 24 | #1,388 | 28.3 |
| 1914 | 24 | #1,207 | 36.7 |
| 1913 | 17 | #1,286 | 33.2 |
| 1912 | 18 | #1,118 | 41.9 |
| 1911 | 11 | #1,077 | 48.7 |
| 1909 | 6 | #1,369 | 36.6 |
| 1908 | 6 | #1,296 | 38.9 |
| 1906 | 5 | #1,328 | 37.6 |
| 1900 | 5 | #1,405 | 33.2 |
| 1897 | 6 | #1,007 | 53.2 |
| 1896 | 6 | #1,047 | 50.2 |
| 1894 | 6 | #1,015 | 51.8 |
| 1893 | 5 | #1,117 | 44.5 |
| 1892 | 8 | #829 | 65.6 |
| 1891 | 5 | #1,037 | 49.4 |
| 1888 | 5 | #1,105 | 41.4 |
| 1885 | 7 | #802 | 64.9 |
| 1883 | 6 | #842 | 57.3 |
Ranks and shares: boys’ names in each year’s SSA file; share of all boys SSA recorded that year.
Is Isidor a boy’s or a girl’s name?
Isidor has been recorded only for boys: SSA lists no girls with the name in 46 years of records (it lists a name only in years with 5 or more babies of a sex).
Girls and boys named Isidor: the SSA national file counts each sex separately.
How many people are named Isidor, and how old are they?
An estimated 68 Americans named Isidor and born in the U.S. are alive in 2026, too few to state an age range. An estimate from SSA’s births and life tables, not a count.
The 2020 Census counted 249 people named Isidor (3 women and girls, 246 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 50 born in the U.S. The Census count is 5.0 times that prediction. Possible reasons: the Census records the name people give, which for many is the short form Isidor rather than the name on their birth record, and it counts people born abroad, whom SSA’s files leave out.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
Names spelled alike
Of these 2 names spelled alike, given to 601 babies since 1880, Isidor is the most given (70% of them).
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880 and in 2025, and each name’s peak year, from the SSA national file, published May 8, 2026. Some are separate names, not spellings of one.
Names that rose and fell in the same decades as Isidor
Names whose births rose and fell across the same decades, measured on each decade’s share of births.
Similar histories: each decade’s share of births, from the SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
More about Isidor and names like it
- Compare Isidor and IsadorBirths, ranks, peak and the living estimate side by side.
- The most given names of the 1910sIsidor peaked in 1914.
- New York’s most given namesThe state where SSA recorded the most babies named Isidor since 1910.
- The top names of 1914The year the most babies were named Isidor.
- Names starting with IMost given first.