Family name ดลสุข (Happy 
, ดลสุข 
, Donsuk 
) , in all the world, is a common last name. The cognomen ดลสุข is characteristic of Sub-Saharan Africa, particularly Nigeria, where it is quite a common surname, Namibia, where it is quite a rare surname, and Eswatini. Measured by absolute frequency, it most frequently occurs in Nigeria, Bangladesh, and Indonesia. More frequently, ดลสุข is the forename as well as the last name.