Last name Eili-Kaija (Eili-Kaija 
) , throughout the world, is an extremely rare cognomen. Much more prevalently, Eili-Kaija is the forename as well as the last name. Parts of the name also exists independently as a first name Eili, and a first name Kaija.
| VARIANT | COUNTRY |
|---|---|
| Eili-Kaija | Finland |