Masculine dossier · first seen 1894
Casimir
Resurgent
Gaining cultural share
Peak era
1919
Peak births
220
Current vitality
Rare
Peak generation
Greatest Generation
Quick answers about Casimir
How many people are named Casimir?
An estimated 1,540 living Americans are named Casimir.
How rare is Casimir?
Casimir is uncommon among babies today, with 73 boys receiving the name in 2025, down 66.8% from its 1919 peak.
How old is the typical Casimir?
The median age of a living American named Casimir is approximately 25 years, with most bearers falling between 9 and 58 years old.
Is Casimir still popular?
Yes — Casimir is currently rising in popularity, with 73 births in 2025. Births this decade are running about 1.6× higher than the previous decade.
Where is Casimir most common?
Casimir has its strongest geographic signal in Illinois, where it appears 5.7× more often than the national baseline.
1894Peak 19192025
Peak year
1919
Decline from peak
66.8%
2025
73
All-time
5,248
Where it lives now
Casimir is most concentrated in Illinois — about 5.6× the national rate in the 1950s.
States where Casimir is given more often than the national average — its present-day heartland.