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