Smullen rhymes with:
macmullen, mcmullan, mcmullin, mullan, mullane, mullen, bulen, cullan, cullen, grullon, hulen, kilcullen, macmullen, mccullen, mcmullan, mcmullen, mcmullin, mullan, mullane, mullen, sullen
Smullen sounds like:
scanlan, scanlin, scanlon, semolina, smallen, smallman, smolen, smolin, snellen, somalian, sumlin