Surname 光永 (Mitsunaga 
, 光永 , Guangyong 
) , throughout the world, is quite a rare family name. The surname 光永 is characteristic of Singapore, where it is a rare surname, Brazil, and China, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in China, Brazil, and the United States. More prevalently, 光永 is the forename as well as the last name.