Family name Тецу (Tetsu 
, Tecu 
, Тецу 
) , across the world, is quite a rare cognomen. The last name Тецу is habitual in Guatemala, where it is quite a common surname, Romania, where it is quite a rare surname, and Singapore, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Guatemala, Romania, and Indonesia. More frequently, Тецу is the forename as well as the last name.