Surname 椅子 (Isu 
, 椅子 
) , across the world, is quite a common family name. The last name 椅子 is habitual in Papua New Guinea, where it is quite a rare surname, Nigeria, and United Arab Emirates, where it is a rare surname. Measured by absolute frequency, the name is most common in Nigeria, India, and Indonesia. Also, 椅子 is the forename as well as the last name.