Cognomen Nitsin (นิจสิน 
, Nitsin 
, นิจศิล ) , globally, is a very rare surname. The family name Nitsin is habitual in Thailand, where it is a very rare surname, Kyrgyzstan, and Georgia. In absolute terms, it is the most numerous in Thailand, Russia, and Kyrgyzstan. Likewise, Nitsin is the forename as well as the last name.