Daddy-o rhymes with:
cadieux, gladieux, addeo, amadeo, bonadio, cadieux, cardio, custodio, degidio, delgaudio, donadio, dovidio, gaudio, gladieux, medio, nordio, pappadio, samudio, servidio, silvadio, taddeo, televideo, video, zamudio
Daddy-o sounds like:
d, d'etat, d'etude, da, dad, dada, daddy, dade, dado, dady, dae, daewoo, dah, dai, daido, daiei, daiwa, dao, daoud, dat, data, date, dated, dato, dau, daw, dawdy, dawe, dawit, day, daya, daye, ddt, de, dea, dead, deadhead, deadwood, deady, death, dede, dedo, dee, deed, deeded, deedee, deedy, deet, deity, deo, detty, dew, dewey, dewit, dewitt, dewitte, dewoody, dewy, dey, deyo, deyoe, dhia, di, dia, did, diddy, didi, dido, die, died, diede, diet, diodati, diodato, diode, dith, ditto, ditty, diwa, do, dodd, dodi, dodo, doe, doh, doha, doi, doo, doodad, doody, dot, dote, doth, doto, dott, dotted, dottie, dotty, doty, doud, douthat, douthett, douthit, douthitt, doutt, douty, douwe, dow, dowd, dowda, dowdy, dowe, dowie, dowty, du, dud, duda, dudd, duddy, dude, due, dueitt, duet, duey, duh, duhe, dui, duo, duthie, dutoit, dutt, duty, duwe, dwi, dyad, dye, dyed