Colby vs Kolby
Colby leads today (#615 vs #1,222), though both are past their peak.
145 years, head to head
Babies named Colby and Kolby per year in U.S. Social Security records, 1880–2025.
Head to head
2025 rank
#615
#1,222
Babies named in 2025
455
165
Peak year
2001
2001
Trend
Declining since 2002
Declining since 2002
Usually for
Boys
Boys
Lifetime births
53,971
11,650
Try another matchup
Colby against names whose popularity has moved like its own.