Family name สุทธิณัฐ (Suttanut 
, สุทธิณัฐ , Suttinut ) , all over the world, is an extremely rare surname. The surname สุทธิณัฐ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, สุทธิณัฐ is the forename as well as the last name.