Köhler is a German occupational surname literally meaning "charcoal burner" People. Achim Köhler (born 1964), German politician. Alban Köhler (1874–1947), German radiologist. Born in Petsa (Thuringia), he discovered a rare foot disorder found in children which was named Köhler disease in his honour. He died in Niederselters. August Köhler (1866–1948), microscopist and inventor of the Köhler illumination. Axel Köhler (born 1959), German countertenor and opera director. In 1994, he won the Handel Prize. Since 2009, he has been Artistic Director of the Halle Opera House.
https://en.wikipedia.org/wiki/K%C3%B6hler