I have a few characters who get Elven names at the end of the novel as a sort of honor. But other than that, most of my characters only have one name.

To maintain some level of believability and consistency within my world, I do use multiple names, mostly the version the elves use and the version men use. I don't do this extensively, but I can think of a few examples of location names and even my antagonist's name, being Vaulrod to men and Karuld to the elves.

Most of my problems with mulitple names, I've managed to fix...

But this year's NaNo has characters with long names and what we forum-users call 'usernames'. People have begun naming their kids after themselves to preserve the family line and to remember where they came from before the story began.

So a couple generations might go something like this: Peter Skye, father of Jerome Peter Skye who is married to Silvi Ain Lieshellyk, parents of Heron Jerome Lieshellyk Skye. It's a mouthful.