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Last name Ireneusz (Ireneusz
, Irenaeus
, Ириней
) , throughout the world, is a widespread surname. The cognomen Ireneusz is characteristic of Eastern Europe, particularly Poland, where it is a common surname, Hungary, where it is a rare surname, and Bulgaria. Not in comparison with a country's population, it is commonest in Poland, Nigeria, and China. Much less frequently, Ireneusz is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ireneusz | United Kingdom, United States, Poland, Germany, Ireland |
| Irenaeus | United Kingdom, United States, Austria, Nigeria, Germany |
| Ириней | Ukraine, Kazakhstan, Belarus, Russia, Bulgaria |
| Иренеуш | Belarus, Russia |