I must say the enclosed letter from Rütten and Loening is a bit stiff. Do I suffer this impertinence because of the possession of a German name, or do their lunatic laws require a certificate of 'arisch' origin from all persons of all countries? … I do not regard the (probable) absence of all Jewish blood as necessarily honourable; and I have many Jewish friends, and should regret giving any colour to the notion that I subscribed to the wholly pernicious and unscientific race-doctrine.
No. 30: Letter to Stanley Unwin (25 July, 1938); Tolkien's German publishers had written to ask him whether he was of "Aryan" origin. - The Letters of J. R. R. Tolkien (1981)