Cognomen Kochna (Kochna 
, ก้อชนะ) , globally, is a very rare surname. The last name Kochna is characteristic of Poland, where it is a very rare surname, France, where it is an extremely rare surname, and the United Kingdom. Measured by absolute frequency, it is the most numerous in Poland, India, and France. Likewise, Kochna is the forename as well as the last name.