Kastner rhymes with:
castner, castner, castner, christner, costner, forstner, gerstner, kaestner, kestner, kistner, koestner, leistner
Kastner sounds like:
kaestner, kastenmeier, kattner, kestner, ketner, kettner, kistner, kitamura, kitner, kittner, koestner, kostmayer, kudner, kutner, kuttner