Antoni is a Catalan, Polish, and Slovene given name and a surname used in the eastern part of Spain, Poland and Slovenia.
As a Catalan given name it is a variant of the male names Anton and Antonio.
As a Polish given name it is a variant of the female names Antonia and Antonina.
As a Slovene name it is a variant of the male names Anton, Antonij and Antonijo and the female name Antonija.
[1] As a surname it is derived from the Antonius root name.