O'byrne rhymes with:
o'beirne, obyrne, amburn, bern, berne, burn, burne, byrne, new-bern, o'beirne, obyrne
O'byrne sounds like:
o'beirne, o'brian, o'brien, o'bryan, obeirne, oberman, oberon, obrian, obrien, obryan, obyrne, offerman, offermann, operan, opperman, oppermann, ovarian, overman, overran, overrun