I actually wouldn’t consider
Evelyn similar to
Elowen.
Elowen is much softer and isn’t classic. Besides, one syllable change can make all the different in a name. Personally, I love
Elowen and don’t particularly like
Evelyn.
Elwyn looks too feminine to me. I like
Elwin, though.
Alvin is handsome but reminds me too much of the mischievous chipmunk.