Cognomen Tėn (Тэн 
, Tėn) , globally, is a rare family name. The last name Tėn is habitual in Central Asia, particularly Kazakhstan, where it is a rare surname, Kyrgyzstan, and Uzbekistan. Measured by absolute frequency, it is the most numerous in Russia, Uzbekistan, and Kazakhstan. Much less frequently, Tėn is the forename as well as the last name.