Meaning A boy's name of English origin, it means "Son of Gilbert." Origin of Fitz Gilbert English +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Fitz Gilbert Similar Names Fitz Gibbon Gilbert Fitz Adam Fitz Gerald Fitz Hugh Fitz James Fitz Patrick Fitz Simon Fitz Walter Fitz Water Year by Year Popularity of Fitz Gilbert