Last name ซ่าย (Sai 
, ซ่าย) , worldwide, is a widespread cognomen. The surname ซ่าย is habitual in Mongolia, where it is a prevalent surname, Myanmar, where it is a common surname, and Malaysia, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Myanmar, India, and Mongolia. More frequently, ซ่าย is the forename as well as the last name.