Family name Xsu (Xsu 
, Хсу 
) , across the world, is a rare last name. The cognomen Xsu is characteristic of Myanmar, where it is quite a rare surname, Russia, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Myanmar, Russia, and China. More prevalently, Xsu is the forename as well as the last name.