Giacomo is the Italian form of James, which goes back through the Late Latin Iacomus to the Hebrew Jacob and means "holder of the heel" or "supplanter". Italy's famous Giacomos include the composer Giacomo Puccini and the adventurer Giacomo Casanova. In the United States the name belongs mainly to Italian American families; it ranked number 3459 in 2000, peaked at number 2217 in 2005 and stands at number 2654 in 2025 with 49 boys.