Hefferan rhymes with:
hefferon, hefferon, hefferon, aldebaran, amparan, anaren, andren, askren, bargeron, bundren, cameron, catherine, coldren, condren, corcoran, cothren, fondren, halloran, hefferon, hendren, holdren, holleran, holloran, killoran, lutheran, mandarin, margarine, milliron, motoren, nitroglycerin, nitroglycerine, o'hallaron, o'halloran, o'halloron, ohalloran, operan, orgeron, pickren, saccharin, saharan, tamarin, tiberon, uterine, veteran, voltaren
Hefferan sounds like:
haberman, habermann, habyarimana, havran, havron, heavrin, hebron, hefferman, heffern, heffernan, hefferon, heffron, heparin, hepburn, hibernia, hoberman, hooperman, huberman, hyperion