Petek is a surname. It means "Friday" in Slovene and Serbo-Croatian (Kajkavian). Notable people with this surname include:
Božo Petek, Slovenian author Damjan Petek (born 1973), Slovenian judoka Franci Petek (born 1971), Slovenian ski jumper and geographer Hrvoje Petek (born 1958), Croatian-born American physicist
See also
Patek (surname)