Maciej (Polish pronunciation: [ˈmat͡ɕɛj]) is a Polish given name, the etymological equivalent of Matthias. Its diminutive forms are Maciek, Maciuś. Namedays according to Polish calendar: 30 January, 24 February, 14 May. Maciej may refer to: Arts and entertainment. Maciej Cieślak (born 1969), Polish guitarist and songwriter. Maciej Dunal (1953–2014), Polish actor and singer. Maciej Fortuna (born 1982), Polish jazz trumpeter, composer and musical educator. Maciej Jachowski (born 1977), Polish actor. Maciej Kozłowski (1957–2010), Polish actor. Maciej Łukaszczyk (1934–2014), Polish pianist.
https://en.wikipedia.org/wiki/Maciej