O'brien rhymes with:
obrien, brien, obrien, brien, obrien, tryin', brien, obrien, tiein, tryin'
O'brien sounds like:
o'beirne, o'brian, o'bryan, o'byrne, obeirne, oberman, oberon, obrian, obrien, obryan, obyrne, offerman, offermann, operan, opperman, oppermann, ovarian, overman, overran, overrun