Last name Сайс (Saiz 
, Saeys 
, Сайс 
) , worldwide, is a common cognomen. The last name Сайс is characteristic of Liechtenstein, where it is quite a common surname, Spain, and Belgium, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Spain, the United States, and Colombia. Also, Сайс is the forename as well as the last name.