Elwin rhymes with:
delwin, delwyn, nellwyn, selwin, selwyn, alwin, alwyn, aylwin, delwin, delwyn, nellwyn, selwin, selwyn, walwyn
Elwin sounds like:
eelam, ehlen, ehlmann, eilan, eileen, el-nino, elaina, elaine, elam, elamin, elan, elane, elayne, eleen, elena, elene, eline, ellamay, ellan, ellemann, ellen, ellena, ellene, elliman, ellman, ellmann, ellyn, elm, elma, elman, elmo, elna, elyn