Last name リョウコ (Ryoko 
, リョウコ , Ryouko 
) , around the world, is a common family name. The last name リョウコ is characteristic of Japan, where it is quite a common surname, Malaysia, where it is a rare surname, and Indonesia, where it is a very rare surname. Not in comparison with a country's population, the name is most common in Japan, China, and Indonesia. Very seldom, リョウコ is the forename as well as the last name.