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