Last name 光易 (Mitsuyasu 
, 光易 ) , all over the world, is a rare cognomen. The family name 光易 is habitual in Hong Kong, where it is a rare surname, Japan, where it is a very rare surname, and Brazil. Measured by absolute frequency, it is the most numerous in China, the United States, and Brazil. Much more frequently, 光易 is the forename as well as the last name.