Relf rhymes with:
relph, chelf, delph, elf, helf, herself, himself, hisself, itself, myself, oneself, ourself, relph, self, selph, shelf, theirself, themself, yourself
Relf sounds like:
ralf, ralph, relief, relieve, relive, relph, rohlf, rohloff, rolf, rolfe, roloff, rolph