Honestly, 'lycanthrope' sounds even goofier, like some anglophone prat showing off daddy's first-year-Greek dictionary before they even went to language class.

I don't like 'lycanthrope', to me it's too unwieldy with too many hard (as in rocklike, not difficult) sounds. Also, I may have read to many LKH books. Loup-garou flows, like one could break into a yodel down the road:

"When I'm calling you-ooo-ooo-ooo'
Dooby-dooby-doo, with my loup-garou..."

But 'lycan' was referenced by Castle last night FTW.
 

Butcher did it, imo, with Loup Garou. That stupid name still makes me cringe everytime I read it. But I can forgive one mistake, because he's done so many other wonderful things with his writing to make up for it.

You did know loup garou is werewolf in French, didn't you?