Caerwyn,
Colwyn,
Islwyn,
Maldwyn,
Heddwyn are neat. Not favorites - I probably can't pronounce most of them quite right - but they're appealing.
-wyn is super Welsh looking to me, and more likeable to me when it's a Welsh name. I usually prefer -win spellings for not-so-Welsh names. Norwin strikes me as appealing.
- mirfak