Last name Thasi (Thasi 
, ทสี 
, ทาสี ) , worldwide, is quite a rare surname. The surname Thasi is habitual in Lesotho, where it is quite a common surname, Thailand, where it is quite a rare surname, and Saudi Arabia, where it is a very rare surname. Measured by absolute frequency, the name is most common in Thailand, Lesotho, and Nigeria. Much less frequently, Thasi is the forename as well as the last name.