Ortwin rhymes with:
chatwin, chetwin, litwin, aldwin, aldwyn, algonquin, alwin, alwyn, audwin, aylwin, berwyn, borwn, bronwen, bronwyn, chatwin, chetwin, corwin, darwin, delwin, delwyn, derwin, durwin, elwin, erwin, garwin, gauguin, gershwin, gerwin, gladwin, godwin, goldwin, goldwyn, goodwin, hadwin, hardwin, holquin, jacquin, jadwin, kerwin, kirwin, litwin, ludwin, marwin, medwin, merwin, merwyn, naquin, nellwyn, norwin, norwyn, paquin, quinobequin, sanguine, selwin, selwyn, sherwin, unwin, walwyn
Ortwin sounds like:
oration, ordain, ordoyne, oriordan, orten, ortman, ortmann, orton, ortwein