Colby ranks #826 with 141 male registrations. The name is an English surname-derived first name that crossed from human to pet registries in the late 2010s, and on a pet license it often pulls double duty: surname-friendly, cheese-adjacent, and breed-flexible.
The surname-as-pet-name register
Colby derives from an Old Norse place name meaning roughly "Koli's settlement," and it sits in the cluster of single-syllable-feeling surnames that work as both human and pet names: Cody, Brody, Tucker, Cooper. On pet licenses it lands on medium-to-large dogs without strong breed concentration: golden retrievers, labrador mixes, and shepherd mixes whose owners wanted a name with American-outdoorsy register.
The cheese-noun bonus
Households with a sense of humor about Colby cheese (the mild orange cheese first produced in Colby, Wisconsin in 1885) sometimes layer the food reference on top of the surname use. This adds the food-noun pet aesthetic without the explicit silliness of names like Cheddar or Brie. The double-meaning works particularly well for cream or buff-colored dogs.
Sound and the counter-reading
Two syllables, front-stressed (KOHL-bee), with a hard K opening and a soft -y close. The name calls well outdoors and tolerates training-class corrections without sounding harsh. The honest concern is that Colby is a strong human-pet crossover; the human Colby page shows steady SSA presence. Households who want the surname feel without the human overlap might consider Cooper or Tucker.