Don't know why it just came to me, but way back in Wrath of the Lich King, my guild pugged a tank for I don't even remember what, might have been Onyxia's Lair Anniversary. The tank's name was Testacleeze. Suffice to say we would laugh on guild chat every time someone said his name.
"Marking Testacleeze."
"Stack on Testacleeze."
What's the funniest name you've ever seen in WoW?