Surname 醬油 (Soja 
, Soya 
, Joiu 
) , across the world, is a common last name. The family name 醬油 is characteristic of Poland, where it is quite a rare surname, Libya, and the Republic of the Congo. Measured by absolute frequency, it is the most numerous in India, Nigeria, and Poland. Likewise, 醬油 is the forename as well as the last name.