Where does “вовцюган” come from?

вовцюган (Ukrainian) comes from Ukrainian вовцю́га, from Ukrainian вовк, from Old East Slavic вълкъ, from Proto-Slavic vьlkъ, from Proto-Balto-Slavic wilkás, from Proto-Indo-European wĺ̥kʷos — wolf.

вовцюган (Ukrainian): wolf