Surname Διάκος (Dijak 
, Diakos 
, Διάκος ) , in the world, is quite a rare cognomen. The cognomen Διάκος is characteristic of Cyprus, where it is quite a common surname, Greece, where it is quite a rare surname, and Slovenia. Not in comparison with a country's population, it is commonest in Greece, the United States, and Mozambique. Much less frequently, Διάκος is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dijak | Slovenia, Australia, India, Croatia, United States |
| Diakos | Australia, Mozambique, Greece, United States, Cyprus |
| Διάκος | Greece |
| Đak | Croatia |
|
αθανάσιος διάκος είστε τέλειοι Greek general, GR (b. 1788) |
|
| διονύσης διάκος 19th-century Greek revolutionary leader, GR (b. 1794) |
|
|
| ιωάννης διάκος Greek revolutionary leader, GR (b. 1805) |
|
|
| αλέξανδρος διάκος GR (b. 1911) |
|
|
| διάκος μανουσάκης Greek dentist and politician (1922-1999), GR (b. 1922) |
|
|
| ιωάννης διάκος GR |
|