Oosterblokker (Dutch) comes from Middle Dutch bloc, from Old Saxon blok, from Proto-West Germanic blokk, from Proto-Germanic blukką, from Proto-Indo-European bhulg'-, from Proto-Indo-European bhelg'- — thick plank, beam, pile, prop.
Ancestry of “Oosterblokker”, step by step
Oosterblokker traces back through 3 separate lines of ancestry.