Kirwan rhymes with:
absecon, acetosyringone, alteon, bergeron, calgon, crampon, decathlon, delaune, devaughn, doggone, einon, haton, incheon, inchon, jumbotron, lieson, malathion, mouton, papon, ptyon, recon, rubicon, savion, savon, scaleatron, sephlon, styron, suon, teason
Kirwan sounds like:
kairamo, karam, karami, karan, kareem, karema, karen, karenina, karim, karimi, karin, karino, karma, karman, karn, karney, karnow, karon, karoun, karren, karun, karyn, kazarian, kearn, kearney, kearny, keeran, keirn, keranen, kerien, kerin, kerman, kern, kernan, kernen, kerney, kerwen, kerwin, kieran, kiernan, kirin, kirn, kirnan, kirwin, koran, korean, koren, korhonen, korman, korn, korona, koruna, krahn, krain, kram, kramm, kramme, krane, krein, kren, krenn, krim, krohn, krom, krome, kromm, kron, krona, krone, kronen, kroon, krum, krumm, krumme, kurian, kuriyama, kurman, kuruman, kyron