Cognomen Gercen (Герцен 
, Gercen 
) , globally, is quite a rare surname. The cognomen Gercen is characteristic of Kazakhstan, where it is quite a rare surname, Russia, where it is a rare surname, and Kyrgyzstan. Not in comparison with a country's population, it is commonest in Russia, Kazakhstan, and Ukraine. Much less frequently, Gercen is the forename as well as the last name.