Surname 水元 (水元 
, Mizumoto 
) , across the world, is quite a rare last name. The surname 水元 is characteristic of Brazil, where it is a rare surname, Japan, and Belgium, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in China, Brazil, and the United States. More prevalently, 水元 is the forename as well as the last name.