Leon vs Theodore
Theodore leads today (#4 vs #138), and both are climbing.
145 years, head to head
Babies named Leon and Theodore per year in U.S. Social Security records, 1880–2025.
Head to head
2025 rank
#138
#4
Babies named in 2025
2,583
13,355
Peak year
1918
2025
Trend
Rising since 1998
Rising since 2000
Usually for
Boys
Boys
Lifetime births
182,638
317,206
Try another matchup
Leon against names whose popularity has moved like its own.