Family name Upan (Upan 
, อุปัน , อุปัญญ์ ) , in the entire world, is a rare surname. The family name Upan is habitual in Estonia, where it is quite a rare surname, Thailand, where it is a rare surname, and Indonesia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Thailand, Indonesia, and Nigeria. Likewise, Upan is the forename as well as the last name.