Kotsonis's rhymes with:
bonuses, bonuses, cardenas's, catacosinos's, ethnos's, eyewitnesses, guinness's, illnesses, likenesses, menaces, minuses, salinas's, selinas's, tennis's, witness's, witnesses'
Kotsonis's sounds like:
katsanos, kitchen's, kitchens, kitching, kitchings, kotsonis, kotsonis'