Family name สุทธิ (สุทธิ 
, Sutti 
, Sutthi 
) , in all the world, is a common cognomen. The surname สุทธิ is characteristic of Thailand, where it is quite a rare surname, Switzerland, and Germany. Not in comparison with a country's population, the name is most common in Thailand, Germany, and the United States. Also, สุทธิ is the forename as well as the last name.