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Surname Siwichai (ศรีวิชัย , Siwichai ) , in all the world, is quite a common last name. The surname Siwichai is characteristic of South-eastern Asia, particularly Thailand, where it is quite a common surname. Much less frequently, Siwichai is the forename as well as the last name.
Nikom, Chayut, Kaeoma, Yasumin, Wilaiwan, Suphaporn, Patcharin, Raychadaporn, Chaiyachet, Pattraporn, and Poonyavatt