You know what teachers say about Wikipedia! You got the person correct. The HMS Bounty mutineers settled on Pitcarin Is, named for a British Midshipman. His descendant was Staffelkapitän Douglas Pitcairn, who as stated, encouraged Heinz to switch from bombers to fighters. In order to bury this dead horse, I'll give you the final link, which is not found in Wiki, btw.
Staffelkapitän Douglas Pitcairn and his wing man, Heinz Bar, scored the first aerial victories for I/JG51 when they shot down a couple of French Hawks on 25 September 1939. And thus we get to Bar's White 13.
Pitcarin has an interesting story in itself. According to the book "Polesti," authored by Dugan & Stewart (Randon
House-1962) p.88, "Pitcairn of Perthshire was descended from a Scottish
Protestant clan which had emigrated to East Prussia in 1830 after
religious quarrels with Catholic neighbors. One of his ancestors was
the midshipman who first sighted Pitcairn Island, the haven of H.M.S.
Bounty's mutineers. The German Pitcairn had grown up in Memel, joined
the revived German air force in the early thirties, and was secretly
trained as a fighter pilot in Gerstenberg's school in Lipetsk in the
Soviet Union. He entered combat in 1936 with a Henkel 51 squadron
flying for Franco and his first enemy aircraft destroyed was a
U.S.-built Curtis, piloted by a French volunteer fo the Loyalists."
All yours Davros!