In the Georgian language "shvili" means son of, or son, as in Johnson. "Djuga" means Jew. Therefore Djugashvili means Jewison.

So Joe Stalin's real name, before he changed it, was Joe Jewison. It gets better, his name was Joseph David Djugashvili, a typical Jewish name. During his revolutionary days he changed his name to "Kochba", the leader of the Jews during one of the anti-Roman uprisings of the Jews. Russians don't change their names. Georgians don't change their names. Jews change their names.