Klaassen rhymes with:
claassen, closson, claassen, closson, glosson, aasen, bossen, chiasson, claassen, closson, crossan, crosson, fossen, glosson, johson, josten, maassen, osten, rosson, rosten, vanfossan, vanfossen, wason
Klaassen sounds like:
kalugin, kaluzny, keelson, kellison, kelson, kilcoin, kilcoyne, klasen, klassen, klejna, klesken, kligman, klugman, klusman