Janusz is a Polish pet form of Jan.
Janusz is also a form of the English and German Janus.
Janusz is also a Polish pet form of the English and Hebrew John.
A variant of the name is the Czech, Dutch, English, German, Polish, Belgian, Scandinavian, and Slavic contracted form Jan.
See also the related form, the Hungarian Janós.
Janusz is not widely used as a baby name for boys. It is not in the top 1000 names. In 2018, among the group of boy names directly related to Janusz, John was the most regularly used.
† English pronunciation for Janusz: Y as in "you (Y.UW)" ; AA as in "odd (AA.D)" ; N as in "knee (N.IY)" ; UH as in "look (L.UH.K)" ; SH as in "she (SH.IY)"