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Family name Saiz (Saiz , サイス , Сайс ) , in all the world, is a common last name. The surname Saiz is characteristic of Liechtenstein, where it is quite a common surname, Spain, and Colombia, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Spain, the United States, and Colombia. Also, Saiz is the forename as well as the last name.