Yep, this part is pretty interesting.

Cuban is Jewish,[11] and grew up in Mount Lebanon, a suburb of Pittsburgh, in a working-class family.[12][13] His paternal grandfather changed the surname from "Chabenisky" to "Cuban" after his family emigrated from Russia through Ellis Island.[14][15] His maternal grandparents were Romanian Jewish immigrants, according to Mark's brother Brian,[16] though Mark has claimed his maternal grandmother was from Lithuania.[17]