Karl's rhymes with:
carl's, carles, carls, karls, carl's, carles, carls, charles, charles', charls, chas, gnarls, karls, sarles, snarls
Karl's sounds like:
karels, karlik, karls, korologos, kralicek, kralik, krolak, krolczyk, krolick, krolikowski, krulwich, kurlak