Last name Jun'Ichi (ジュンイチ 
, 淳一 
, Jun'Ichi ) , in all the world, is a common family name. The cognomen Jun'Ichi is habitual in Eastern Asia, particularly Japan, where it is quite a common surname, and China, where it is an extremely rare surname. Much less frequently, Jun'Ichi is the forename as well as the last name.