Otto rhymes with:
cervesato, grotto, legato, lotto, ostinato, staccato, swatow, aburto, akihito, appetito, barstow, bartow, cervesato, cristo, divertimento, falsetto, gilberto, grotto, gusto, hirohito, humberto, huto, lamberto, legato, lotto, manifesto, mistletoe, murto, norberto, ostinato, photo, pinto, potato, potatoe, presto, puerto, punto, saito, shinto, staccato, steptoe, stretto, swatow, tiptoe, tomato, umberto, undertow
Otto sounds like:
o'day, o'dea, o'dowd, oad, oat, oath, oathout, oda, oday, odd, oddi, oddity, oddy, ode, odea, oded, odette, odowd, ot, ota, otey, otha, ott, ottawa, ottaway, otte, out, outdate, outdated, outdid, outdo, outed, outta, outwit, outwitted, owada, owed