Keker

From the Dutch last name Koker, from "kok" cook or from the German "keck", meanining perky.
Also Kecker.

Kotlyar

Ukranian for teapot maker. Also Kotler, Kotliar, and similar.

Kris

From the Yiddish female name Kresel (from the Italian name Grazia). Thus Kris means Kresel's son.

Kreer

1. From the Yiddish kreyen (to caw or croak).
2. From Krevo, the name of a town in Belarus. Prior to WWII located in the Oszmiany district, Vilna Province, Poland. Part of the Russian Empire before WWI.