I wrote the letter when they started accepting them. I think it was the day before the first broadcast, so about a month ago. Honestly, I was giggling like a crazed lunatic too much to listen closely, but she did answer that it's Yossy. Then proceeded to go into how Yossy, Yossi, and Yossie would each be pronounced.
OH and Mai read my letter in an American accent and then Yossy apologized for how Mai read it. Seriously.
Other than that, I dunno. I hear her say "Jen-san" and die in a fangirlish pile of goo.