Jacek is a derivative of the Portuguese, Spanish, and English Jacinto.
A derivative of Jacek is the Polish Jacus.
See also the related category polish.
Jacek is not commonly used as a baby boy name. It is not in the top 1000 names.
† English pronunciation for Jacek: Y as in "you (Y.UW)" ; AA as in "odd (AA.D)" ; S as in "see (S.IY)" ; EY as in "ate (EY.T)" ; K as in "key (K.IY)"