First of all, you're all talking about a name that does not exist. There is no "Sciaccia".
By the way, speaking of non-existent surnames presented as Italian, I for example never heard of the surname Pentangeli in real life, only in the Godfather movie. I once tried to search for this surname on a site that shows in which regions a particular surname is more common, but "Pentangeli" came with zero results.