Oscar is a classic and popular name in Sweden (originally a Celtic name). But maybe it has negative associations in USA?
Ossian is another Celtic name (also spelt
Oisin) which is now considered by many parents in Sweden.
From your names, I like
Cosmo best. Sounds really cosmopolitan ;)
Oswald makes me think of the murder or J F
Kennedy.
Osiris is too much Egyptian god, and Prosepero is too much Shakespearian magician.
"But it’s all right now.
I learned my lesson well.
You see you can’t please everyone
So you got to please yourself."
Rick Nelson,
Garden Party
"It does not become me to make myself smaller than I am." (
Edith Södergran 1891-1923)