Surname 由美子 (Yumiko 
, 由美子 ) , across the world, is quite a rare cognomen. The surname 由美子 is habitual in Hong Kong, where it is a rare surname, Japan, and Indonesia. Not in comparison with a country's population, it is commonest in Indonesia, China, and Japan. More prevalently, 由美子 is the forename as well as the last name.