thats lots.....here in Australia i would be surprised if there was 50 or so
Kubiak is very popular in Poland.
The Name "Kubiak" came from surname Kuba (average form of Jakub in old times), propably used since XII century, and means just "Kuba's son".
but were did it come from(historically) is it a eastern Slavic name or north/north western?? Poland is the only place i have seen it......other than peoples who have moved away from Poland