Thelin rhymes with:
beilin, belin, bellin, crellin, ellyn, elyn, fellin, helin, kaelin, lewellyn, llewellyn, medellin, melin, mellin, schelin, selin, sellin, stehlin, tellin', yellin, yellin'
Thelin sounds like:
t-lam, taillon, talamo, tallman, tallon, talman, talon, telamon, tellin', thallium, thalman, thalmann, theilen, thelen, thelma, thielemann, thielen, thielman, tholen, thulin, tillman, tillmon, tilman, tilney, tolan, tolen, tolin, tolman, toolan, tulane, tuolumne, tylan