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Surname Sithi (สิทธิ , Sithi , ศิถี ) , all over the world, is quite a common cognomen. The family name Sithi is characteristic of Thailand, where it is quite a rare surname, Laos, and Bangladesh, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Thailand, Bangladesh, and South Africa. Also, Sithi is the forename as well as the last name.