There were three of them in my grade in elementary school (California, circa 1980) - one
Shaun and two Shawns. I had a crush on one of the Shawns, now that I think about it. I had forgotten ... anyway I still think
Shawn is the most "handsome" spelling.
Sean makes me think
Sean Connery, and his character-image generally.
Sean isn't quite as dated, but is still pretty dated. About like
Aaron - still usable, but a dadname.
- mirfak