Surname Вільйо (Viljo 
, Wiljo 
, Вільйо 
) , in the entire world, is a very rare cognomen. The family name Вільйо is habitual in Northern Europe, particularly Finland, where it is a rare surname, and Estonia. More prevalently, Вільйо is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Viljo | Sweden, Finland, United States, India, Canada |
| Wiljo | Germany, Philippines, United States, India, Netherlands |
| Вільйо | Ukraine |