This blog post was triggered by seeing a book blurb with a lot of umlauts in the characters’ names… We’re talking more than one per name!
An umlaut, in case you don’t know, is the little two-dot thing sometimes seen above vowels in certain languages. It indicates a different pronunciation from the usual one. (There’s also the metal umlaut, which is strictly decorative. I suspect a lot of fiction writers are actually using the metal umlaut without realizing it.)
Once upon a time, writers and readers would joke about overuse of apostrophes in fictional names: “Apostrophes make you alien,” or something like that. Perhaps due to these jokes, SF/F writers have mostly stopped using apostrophes to decorate non-human names. Now many of them sprinkle umlauts all over the place instead.
If apostrophes make you alien, perhaps umlauts make you elvish.
(Disclaimer: None of Weaver’s elves have umlauts in their names. No, not even that one.)