The name in English seems a bit gimmicky. "Älv" in the context means "river" and not "elf". I guess someone choose to use this play on words in the translation to pique interest and garner sympathy.
Edit: Ok, never mind. It's definitely a translation thing: "The English name of the vernacular was introduced in Dahl & Koptjevskaja-Tamm (2005)."
Very recent too.