Surname ต้นสาย (Late 
, ต้นสาย) , throughout the world, is a common family name. The surname ต้นสาย is characteristic of India, where it is quite a rare surname, Gabon, and Bahrain. Not in comparison with a country's population, it is the most numerous in India, Myanmar, and Indonesia. Much less frequently, ต้นสาย is the forename as well as the last name.