Hehe...would you believe, I never intended Koshi to sound like Yoshi...it started off Koshizu (well, it still is) But then people called me Koshi, and it just stuck. It wasn't intentional, I swear! n_n* Funny how coincidental it looks though, right? <=]
And, I was looking through Japanese pronounciaton sites, and I think Josie is said 'Joshi'...n___n* But I'm not 100% sure. Weird if it was though! =]