Claim: An Italian surname that means little Jacob is Comollo which also has five variants, one of which is Jacobellis
Evidence: Comollo is an Italian surname localized in the northern regions of Piedmont and Liguria. Little Jacob (truncated) Comolli, Comelli, Comino, Giacomelli, Giacometti, Giacomino, Jacobelli, Jacobellis and similar