Last name 세연 (세연 , Se-Yeon ) , all over the world, is an extremely rare surname. Much more prevalently, 세연 is the forename as well as the last name.
Seyeon, and セヨン
, Se-Yeon 
) , all over the world, is an extremely rare surname. Much more prevalently, 세연 is the forename as well as the last name.