[ 2 syll. col-by, co-lby ] The baby boy name Colby is sometimes used as a girl name. Its pronunciation is KAAL-Biy- or KOWL-Biy- †. Colby is used predominantly in the English language and its origin is Old English. The name is of the meaning coal town, Cola's town, Koli's town. It is from the elements 'kol' meaning coal, black ; 'býr' village, farm. The first name is derived from an Old English surname, which is itself from an Old Norse place name of the meaning 'coal town', or else 'Cola's town' or 'Koli's town'. See Colby for more information.
Colby is a widely used name; it has 21 variants. Variants include Colbie, Coalbea, Coalbeah, Coalbee, Coalbey, Coalbi, Coalbie, Coalby, Colbea, Colbeah, Colbee, Colbey, Colbi, Colbie, Colbin, Cole, Colebee, Coleby, Collby, Kolby, and Koleby.
See also the related form, Colton (English).
Colby is fairly popular as a baby name for boys. The name's popularity jumped from the 1960s up to the 2000s; before that, it was of sporadic use only. At the modest height of its usage in 2001, 0.187% of baby boys were given the name Colby. Its ranking then was #99. The baby name has since experienced a fall in popularity. In 2012, its usage was 0.045% and its ranking #341, but it was nonetheless the 3rd most popular after Colton and Cole, within all boy names in its group. In 2012, Colton's use outnumbered Colby's by 7 times. Colby has in the past century been predominantly given to baby boys.
† Pronunciation for Colby: K as in "key (K.IY)" ; AA as in "odd (AA.D)" ; L as in "lay (L.EY)" ; B as in "be (B.IY)" ; IY as in "eat (IY.T)" ; OW as in "oak (OW.K)"