Thelma rhymes with:
anselma, aselma, delma, elma, helma, selma, velma, wilhelma, zelma, alma, anselma, aselma, calma, dalma, delma, depalma, dipalma, elma, filma, helma, hilma, l'alma, palma, selma, velma, vielma, vilma, wilhelma, wilma, wylma, zelma, zulma
Thelma sounds like:
t-lam, taillon, talamo, tallman, tallon, talman, talon, telamon, tellin', thallium, thalman, thalmann, theilen, thelen, thelin, thielemann, thielen, thielman, tholen, thulin, tillman, tillmon, tilman, tilney, tolan, tolen, tolin, tolman, toolan, tulane, tuolumne, tylan