Family name Билей (Bilei 
, Biley 
, Bilej 
) , in the entire world, is quite a rare last name. The last name Билей is habitual in Ivory Coast, where it is quite a rare surname, Czechia, where it is a rare surname, and Estonia. Not in comparison with a country's population, the name is most common in Ivory Coast, the United States, and Russia. Also, Билей is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bilei | Indonesia, China, India, Italy, United States |
| Biley | India, Italy, Ivory Coast, United States, Czechia |
| Bilej | Poland, Czechia, Argentina, India, Hungary |
| Билей | Belarus, Ukraine, Kazakhstan, Russia |