Throughout the world, Maciuś (Maciuś 
) is a very rare boy's first name. The forename Maciuś is characteristic of Eastern Europe, particularly Poland, where it is a rare masculine name. Very seldom, Maciuś is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Maciuś | Poland |
Mach, Maciej, Maciek, Macius, Madis, Maffeo, Maffio, Matas, Mate, Matej, Mateo, Mateu, Mateus, Mateusz, Mateuszek, Matfei, Mathew, Mathias, Mathieu, Mathijs, Mathis, Mati, Matiass, Maties, Matija, Matitjahu, Matityahu, Matjaž, Matteo, Matteus, Matthew, Matthias, Matthieu, Matthijs, Matthäus, Matti, Mattia, Mattias, Mattis, Mattityahu, Matvei, Matvej, Matvey, Matveï, Matwei, Matyáš, Matías, Matúš, Mazzeo, Maćko,
Maciuś is also a name for the fictitious and mythical characters: Cześnik Maciej Raptusiewicz , character in Zemsta; Maciej Szymczyk , character in Brzydula; Maciej Boryna , character in The Peasants and Maciej Depczyk .