Surname ธีรนิตย์ (ธีรนิตย์ 
, Theeranit ) , around the globe, is an extremely rare last name. The surname ธีรนิตย์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more frequently, ธีรนิตย์ is the forename as well as the last name.