Meaning Kelby is Celtic name for a boy or girl, it means 'place by the fountain or spring'. Origin of Kelby Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Owen, Ray Pronunciation 🔊 Listen Kelby Similar Names Ain Fontaine Fontane Dathan Tasneen Burim Fontana Fontayne Fonteyne Pillar Year by Year Popularity of Kelby