This girl keeps laughing at my boyfriend's name?

My boyfriend is from India, he came to America when he was 7, and his name is Yosh Kapur. Not Josh, it's Yosh. But every day, this girl in my P.E. period laughs her head off at his name. She's always saying like "Why would you go out with a boy named YOSH?". It's so annoying. Other people have said it's cool, unique, and such. I personally like his name a lot, I think it's very exotic. And I wouldn't care if it was just her finding it amusing, maybe cracking a few jokes occasionally. But every day she just turns into a hyena about it. How the heck do I get her to stop??? It's incredibly obnoxious.