Grondahl rhymes with:
kuykendall, lindahl, lundahl, rindahl, rosendahl, sandahl, sundahl, amdahl, bergdoll, birkedal, ekdahl, kuykendall, lindahl, lundahl, omdahl, opdahl, rindahl, rosendahl, sandahl, sheldahl, skerdal, skirdall, sundahl, underdahl, youngdahl
Grondahl sounds like:
grandillo, grandly, grendel, grindlay, grindle, grindley, gruntal