Cognomen Тертий (Terty 
, Тертий 
) , around the globe, is a very rare family name. The surname Тертий is habitual in Kyrgyzstan, where it is a rare surname, Russia, where it is an extremely rare surname, and Ukraine. Not in comparison with a country's population, this name is the most popular in Kyrgyzstan, Russia, and the United States. More frequently, Тертий is the forename as well as the last name.