Family name Сойа (Soja 
, Soya 
, Soia 
) , in the entire world, is a common last name. The surname Сойа is characteristic of Poland, where it is quite a rare surname, Libya, and the Republic of the Congo. In absolute terms, it most frequently occurs in India, Nigeria, and Poland. Also, Сойа is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Soja | Indonesia, Poland, India, United States, Nigeria |
| Soya | Indonesia, India, United States, Tanzania, Nigeria |
| Soia | South Africa, India, Malaysia, United States, Nigeria |
| Сойа | Russia |