Of the main two elvish languages (Sindarin and Qenya) one was primarily based on Finnish, the other on Welsh. (Perhaps someone can remind me which is which.)

The great thing about elvish is that it is so complete that people who know it can make stupid banal sentences that you might find in a phrase book. That is the mark of a complex language.

I like inventing names too -- much of my own made up language also comes with its own mythology, pantheon, society and culture etc because that is the stuff I like lots, eh. And several of the names are actually based on words.