Can you really change your name in whatever you like in the USA?
It's really harder in France. You need to have very good reasons for a change and there are some important limitations (I believe you can either change a few letters or take the name of your mother or grandmothers, that kind of things).
It's too bad you don't like Ryan. It's not a bad name and it would be easier for your friends, workmates, family and stuff. One of the reasons I don't change my last name, besides how hard it is here, is that I feel like people would find that odd.
Now about your last name, you seem not to like it because it's your parent's one. Well.. It's also your grandfather one, don't you like him either? Sounds like a bad reason to me :/
Edit: Should have readed lio45 before posting, it might answer a lot.