Gwendolyn rhymes with:
candellin, candellin, madelin, madeline, adrenalin, beguelin, candellin, carolyn, carolyne, eveline, globulin, hamelin, jacqueline, jessalynn, karolyn, madelin, madeline, margolin, matalin, nicolin, ritalin, rosalyn, sakhalin, schieffelin, sokolin, ugolin
Gwendolyn sounds like:
gentleman, gentlemen, gentlewoman, gentlewomen