William Henry Pratt was the real name of which horror film star?

Had no idea he was English.

from searching, "He changed his professional name to "Boris Karloff" around 1909, reportedly choosing "Boris" for its exotic sound and adopting "Karloff" as a family name, though his daughter denied any Slavic ancestry."

I love the old Karloff movies! Many great performances.

Yes he was English,& he had Indian heritage

I thought he was European, maybe Romanian, due to his name. Scary actor.