Thielen rhymes with:
bielen, elan, heelan, keelan, lealan, nealon, neilan, sheelen, wheelan, wheelon
Thielen sounds like:
t-lam, taillon, talamo, tallman, tallon, talman, talon, telamon, tellin', thallium, thalman, thalmann, theilen, thelen, thelin, thelma, thielemann, thielman, tholen, thulin, tillman, tillmon, tilman, tilney, tolan, tolen, tolin, tolman, toolan, tulane, tuolumne, tylan