Casmir
#10,905 in 2025Boys' nameMeaning not yet documented
Casmir has been given to 356 babies in the U.S. since 1913. In 2025 it ranked #10,905 of 13,926 boys’ names in use. Its peak year was 1918, with 24 recorded.
Babies named Casmir, 2025
1 in 553,000
Casmir over time, 1880–2025
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 Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.
How common is Casmir?
Everything below is computed from the 2025 data — the most recent year available.
- Among all babies, 2025
- 1 in 553,000
- 6 of 3,315,165 births
- Among boys only
- 1 in 285,000
- <0.01% of boys
- Rank, 2025
- #10,905
- of 13,926 boys’ names in use
- Coin-flip room size
- 382,984 kids
- Even odds of a second one
Where Casmir sits on the popularity scale
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.
Put another way: gather 382,984 children born in 2025 and it's an even bet that one of them is another Casmir. In a class of 30 the chance is Under 1%.
When Casmirs were born
Half of everyone ever recorded as Casmir was born before 1925 — so the typical Casmir is around 100 today.
- Biggest decade
- 1910s
- 34.2% of all use
- Born in the last 25 years
- 22.2%
- Spread across generations
- Recorded since 1950
- 76
- People you could plausibly meet
1910s — 34.2% of all recorded uses (117).
Is Casmir 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
- −1,775
- Places dropped
- Rank vs 5 years ago
- −3,792
- Places dropped
- Rank vs 10 years ago
- —
- Not ranked then
- Births vs 10 years ago
- —
- Not published both years
- Share of its own peak
- 25.0%
- Peak was 1918 (24)
- Years since peak
- 107
- Years
- Year-to-year steadiness
- Volatile
- 28.8% average annual change
Spellings of Casmir
Casmir is not the most common spelling — Amir is, with 38.9% against Casmir's 0.24%.
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 Casmir is used
Across 1910–2025, Casmir was most concentrated in Illinois — about 1 in — boys, against 1 in 1,212,892 across all states with data. It was least common in Pennsylvania (1 in —).
Most concentrated
- 1Illinois1 in —
- 2Michigan1 in —
- 3New York1 in —
- 4Pennsylvania1 in —
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. Casmir has too little recent state data to map, so this covers all years from 1910.
Casmir by the numbers
The raw record for each sex the name is used for.
As a boy's name
Names similar to Casmir
Matched on shared beginnings and endings, similar length, and comparable popularity.
Sibling names for Casmir
Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.