yep - seems a litle creepy, but I wouldn't expend too many cells worrying about it if I were in your shoes.

If I may offer my opinion, though; I think it's reasonable that you wish he would call himself something else, but I don't think it's your place to ask him to do that. He also might find it a bit creepy that you're spotting him on other sites and confronting him about his name choice. I've known you for a while now and I certainly don't think that you're the type to cyberstalk, but if I were in his position, I might feel that way, especially after you asked him to change his name. He needs to have some independence and privacy, especially seeing as though you're not his girlfriend. Just my 2c - and know that you are free to disagree without worrying about hurting my feelings.

Good luck,
LMo