"Oooh, then he has good taste!" Unless it turns out he's a horrible person, but, well, Joker wouldn't necessarily be surprised at that, either. He just continues to grin. "It's a name I named myself, if yer really so curious ta know!"

Although if they're talking about names... He waves one hand down a little lower. "If ya meet the most adorable girl in the world, with brown hair and bangs over one side of her face, that's Doll, and I named her, too! Because she's my precious little sister~." Playfully, he winks.

...But it is true.