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'Tonnes of people' might be an overstatement. Other than the immediate relatives of Adolf Hitler (father, mother, siblings, half-siblings and their children), no other people with the surname Hitler are known.

And there is a good reason for that. The surname „Hitler” is an alternative spelling of „Hiedler”. Hitler's father, Alois Schicklgruber, decided to change his name to his stepfather's family name, „Hielder”. Likely because Alois was born out of wedlock and wanted to rid himself of his old surname once he became established. It is unknown why he changed the spelling to „Hitler”.

Adolf Hitler did comment once that he thanked his father for changing the surname, as „heil Schicklgruber” would have sounded awkward.