Castillon rhymes with:
castellon, castellon, bordelon, bouchillon, castellon, adlon, axlon, baylon, bisaillon, bordelon, bouchillon, castellon, donilon, heptathlon, magallon, moleculon, orelon, revlon
Castillon sounds like:
caitlin, castellana, castellani, castellano, castellon, castleman, catalan, catalano, catalina, catalonia, catalonian, cathleen, catlin, cattlemen, chitlin, coastline, codlin