Champlain rhymes with:
complain, complain, explain, plain, plane, splain, splaine, ahlen, alain, alaine, alane, alayne, allain, blain, blaine, blane, blayne, charlayne, complain, delaine, elaine, elane, elayne, explain, galane, helane, lain, laine, lane, layne, ln, maclaine, maclean, mcclain, mcclaine, mcclane, mclain, mclane, plain, plane, slain, slaine, slane, splain, splaine, tulane