Surname ส่าย (Sai 
, ส่าย) , around the globe, is a widespread last name. The last name ส่าย is characteristic of 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 commonest in Myanmar, India, and Mongolia. More frequently, ส่าย is the forename as well as the last name.