Maybe this earring is related to Naruto and his ability to annoy his enemies. And for the K, SE is not going to pay royalties for an item name, i suppose :P
If you know the names of the characters and their means you are either Masashi Kishimoto or a fan of the series. So you hate yourself... (And i suppose that's why you are posting those friendly answers to posts that intended to be funny >.>)
Actually, this item came out in the update before the "nerf" update. Wouldn't matter anyway considering the +10 enmity lasts only about 30 seconds and that the "nerf" did absolutely nothing to Ninja. I tanked just as I did before the update.