Surname Деико (Deiko 
, Deyko 
, Деико ) , worldwide, is a rare family name. The cognomen Деико is characteristic of Latvia, where it is quite a rare surname, Belarus, where it is a rare surname, and Ethiopia, where it is a very rare surname. In absolute terms, this name is the most popular in Ethiopia, Russia, and Indonesia. Also, Деико is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Deiko | Japan, Indonesia, Russia, Belarus, Latvia |
| Deyko | Ethiopia, Russia, Mexico, United States, Ukraine |
| Деико | Russia |