Köstner or Koestner is a German surname. It can either be a toponymic surname derived from a place named or Köstenberg, or an occupational surname derived from the occupation of kastner, the manager of the lord's possessions, treasurer.Köstner, DFD Notable people with the surname include:

(1912–1982), German wrestler Eduardo Javier Rubio Köstner (born 1983, Chuquicamata), a Chilean international footballer Elmer Koestner (1885–1959), a Major League Baseball pitcher (1906–1982), Austrian bishop Lorenz-Günther Köstner (born 1952), a German footballer Nikolai Köstner (born 1975), German table tennis player

Koestner

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