Page "Elf" Paragraph 54

Jacob Grimm in his Deutsches Wörterbuch deplored the " unhochdeutsch " form Elf, borrowed " unthinkingly " from the English, and Tolkien was inspired by Grimm to recommend reviving the genuinely German form in his Guide to the Names in The Lord of the Rings ( 1967 ) and Elb, Elben was consequently reintroduced in the 1972 German translation of The Lord of the Rings.