Boy name origins & meanings
- Hebrew : Faithful; dog; bold
- English : Dark-haired
- Scandinavian : From the dark country
Family name origins & meanings
- English : habitational name from places in Norfolk and Cumbria named Colby, from the Old Norse personal name Koli (a byname for a swarthy person, from kol ‘(char)coal’) + Old Norse býr ‘settlement’.
- Variant spelling of Norwegian Kolby, a habitational name in Akershus, with the same etymology as 1.