I want to like the name
Sirius, for the celestial connection. But I hear "serious." If I were introduced to a little
Sirius, my first thought would be, "Are they Puritans?"
Casper, I love. :-)
For my generation (40 somethings) the connection to
Casper the Ghost is immediate. But if I can get over that, then I don't see why your generation couldn't see past the HP character(s). [I agree that HP is not a bad image, it's just that the names have other aspects and you'd love them to be seen in their full glory, right?]