Last name สิทธ (Sit 
, Siddh 
, Sithonh 
) , globally, is a common cognomen. The cognomen สิทธ is habitual in Macao, where it is quite a common surname, Bermuda, and Hong Kong (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in India, Myanmar, and Hong Kong. Also, สิทธ is the forename as well as the last name.