Worldwide, Milien (Million 
, Milien 
) is quite a common gender-neutral first name. The first name Milien is characteristic of Sub-Saharan Africa, particularly Ethiopia, where it is quite a rare gender-neutral name, South Africa, where it is quite a rare masculine name, and Zimbabwe, where it is a rare male name. Measured by absolute frequency, it is the most numerous in Sub-Saharan Africa, particularly Ethiopia, South Africa, and the Democratic Republic of the Congo. More frequently, Milien is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Million | France, Ethiopia, United States, South Africa, Cameroon |
| Milien | Dominican Republic, France, Haiti, United States, United Kingdom |