Namebino · Girl names · Boy names
Boy's name · #615 in the US (2025) · 2000s wave
89% boys · 11% girls — Colby is also given to girls: 60 in 2025, about 11% in recent years. Colby →
Colby's best rank, #99, came in 2001; it has stepped well back to #615 today. Roughly 54,000 boys have been named Colby since 1888.
In recent years, Colby ran 4–6× its national rate in New Hampshire and Maine.
Appears in 2020-2025 birth records of 39 states. See the full state-by-state map on this page.
See how Colby ranks in other countries and regions.
#199 in N. Ireland (2025) · #224 in England & Wales (2025) · #279 in Scotland (2025) · #595 in Ireland (2025) · #493 in Canada (2024).
Among 119 notable people named Colby:
Sports figures appear 2.93× more often than among typical names — e.g. Colby Covington, American mixed martial artist (born 1988).
Together with its spelling variant Kolby (#1225), Colby would rank around #486 with about 620 births last year — the newborns split about 73/27 between Colby and Kolby.
Similar names: Kolby · Skyler · Collin · Toby · Peyton · Cole
Browse more boy names — popularity, trends and eras for 5,700+ American names, free.