Letter of recommendation?

I'm applying to college this year and I've asked my history teacher from last year to write me a recommendation letter. He knows me very well (I even play in his band) and I'm sure he'll write me an excellent letter.

The only problem is he sucks with names. He called me the wrong name multiple times today and I gave up on trying to correct him and just started responding to the wrong name. Now I'm terrified that he's going to write the wrong name in my recommendation letter which would destroy my application!!!! (if you're wondering, I don't get to read the letter before he sends it). I'm wondering: what I can do to ensure that the right name gets put on the letter???????? Please help, I'm super scared and feel like throwing up right now!!!