Cognomen Сайнс (Sainz 
, Sines 
, Sáinz ) , across the world, is a common surname. The family name Сайнс is habitual in Mexico, where it is quite a common surname, Spain, and Bolivia. Measured by absolute frequency, this name is the most popular in Mexico, the United States, and Spain. Very seldom, Сайнс is the forename as well as the last name.