Coulombe rhymes with:
colombe, colombe, lacombe, luscombe, mccombie, abercrombie, bambi, biamby, camby, colombe, comby, crombie, crumby, cumbie, cumby, demby, fomby, formbey, formby, gumbi, hamby, hemby, lacombe, lambie, lamby, luscombe, mccombie, mumby, nambi, namby-pamby, nimby, palombi, pamby, quimby, rimbey, savimbi, zombie
Coulombe sounds like:
clamp, cleanup, climb, clump, clumpy, collomb, colomb, colombe, colombia, colombo, columba, columbia, columbo, culinova