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Family name Sinit (Sinit , สินิทธ์ , สินิทธิ์ ) , throughout the world, is a rare surname. The family name Sinit is characteristic of Malaysia, where it is a rare surname, Philippines, where it is a very rare surname, and the United States, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Malaysia, Philippines, and India. More prevalently, Sinit is the forename as well as the last name.