Elfhelm's Elf Helm

[Galin]

Maybe the name might mean something like: 'protected (as if) by Elves (magic)'?

But I might be off. The name occurs in Primary World sources, and Leonid L. Korablev's The True Elves of Europe suggests a meaning (not necessarily in a Tolkien context, although '(cf. Elfhelm of Rohan)' is also noted): 'protected by Elves? (helm-protection by Elves)'. The site also notes:

Searle's "Onomasticon" (mentioned by Arundell Lowdham, a character of JRRT's "Notion Club Papers") contains 35 different names of the form AElf + adjective (noun); it mentions 75 recorded bearers of the name AElfwine "Elf-friend".