Cognomen Вайнио (Vainio 
, Вайнио 
) , around the globe, is quite a common family name. The family name Вайнио is characteristic of Northern Europe, particularly Finland, where it is a common surname, Estonia, where it is quite a rare surname, and Sweden. Measured by absolute frequency, it is the most numerous in Finland, Sweden, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Vainio | Sweden, Czechia, Finland, United States, Canada |
| Вайнио | Russia |