Langevin rhymes with:
alvin, arvin, beavin, belvin, bergevin, bevin, bivin, bovin, carvin, cavin, chavin, clavin, colvin, corvin, covin, cravin, curvin, davin, delvin, dervin, devin, disproven, earvin, elvin, ervin, even, evin, flavin, galvin, garvin, gavin, gelvin, gilvin, girvin, givin', glavin, harvin, havin', heavin, irvin, kervin, kevin, kuvin, lanvin, lavin, levin, litvin, livin', lovin, malvin, marvin, marvin's, melvin, melvyn, mervin, mervyn, methvin, nevin, nonwoven, norvin, orvin, parvin, potvin, purvin, ravin, savin, scriven, servin, sevin, skirvin, slavin, slevin, tarvin, zelvin