Last name Do Thi (Do Thi 
) , throughout the world, is a rare surname. The last name Do Thi is habitual in Macao, where it is quite a rare surname, Vietnam, where it is a rare surname, and Singapore. Measured by absolute frequency, this name is the most popular in Vietnam, Macao, and Indonesia. More frequently, Do Thi is the forename as well as the last name.