Well, i am not sure about chinese, but as far as i am concerned, "-son" is often surname-forming suffix in a bunch of languages. (even in english - jackson) In georgian surnames with -shvili, and -dze are very frequent indeed, but we also have other endings.
lexicalized means that is has merged into the surname so much that when one hears for example: vashayidze, nobody thinks that it means: the son of vashayi