Thank you very much, I think it was good intuition In the meantime I found in "Our Italian surnames" (Google books) that it might be diminutive from Giacomo or Giacopo.

Hello, I tried in another place on this forum, but no result - I am interested in meaning of surname Ciaccio. Maybe there is some Italian native speaker, who can tell if it has any specific meaning, or at least what associations it brings? Thank you in advance

Hello, I am interested in meaning of surname Ciaccio - similar to Ciaccia. Maybe there is some Italian native speaker, who can tell if it has any specific meaning, or at least what associations it brings? Thank you in advance