Family name 藥 (Iyu 
, 藥 
) , worldwide, is quite a rare surname. The last name 藥 is habitual in Taiwan, where it is quite a rare surname, Japan, where it is a rare surname, and Indonesia. In absolute terms, it is the most numerous in Eastern Asia, particularly Taiwan, Japan, and China. More frequently, 藥 is the forename as well as the last name.