Hamelin rhymes with:
adrenalin, beguelin, candellin, carolyn, carolyne, eveline, globulin, gwendolyn, jacqueline, jessalynn, karolyn, madelin, madeline, margolin, matalin, nicolin, ritalin, rosalyn, sakhalin, schieffelin, sokolin, ugolin
Hamelin sounds like:
hainline, hamlin, haneline, hanlin, hanlon, heinlein, heinlen, hemline, henline, himalayan, hineline, humulin