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Cognomen Athanasiou (Athanasiou
, Αθανασίου
, Атанасиу
) , worldwide, is a common family name. The last name Athanasiou is characteristic of Cyprus, where it is a common surname, Greece, and Australia, where it is a rare surname. Measured by absolute frequency, it is commonest in Greece, Cyprus, and the United States. Much less frequently, Athanasiou is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Athanasiou | Greece, Australia, Cyprus, United States, Germany |
| Αθανασίου | Greece |
| Атанасиу | Bulgaria, Russia |