Donilon rhymes with:
bisaillon, magallon, orelon, adlon, axlon, baylon, bisaillon, bordelon, bouchillon, castellon, castillon, heptathlon, magallon, moleculon, orelon, revlon
Donilon sounds like:
demoulin, denholm, donelan, donlan, donlin, donlon, donnellan, dumoulin