I've found that when I can't figure out a good name if I instead just take the words that describe that area and either misspell them or (as posted above) see what they sound like in other Germanic languages then it helps a lot.

For instance, Koldara or Flaymwyne instead of Caldera or Flamewind... or Undinos (Undines are other names for Dryads, or water nymphs). Other names could be found from reading books with good names (Tolkien) or historic books. (Outremer is one of my favorite names for an area...)

Mostly, names should be able to aptly describe the area, or (in the case of multi-lingual books) sound cool in the local tongue.