Meaning A boy's name of Norse origin, it means "Pledge." Origin of Gilby Norse , Scandinavian +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Gilby Similar Names Gealan Gib Gilleabart Gilibeirt Gace Gisilbert Bent Lortiz Kelevi Arland Year by Year Popularity of Gilby