If Zak refers to Prophet Isac (father of prophet Jacob) or short name for the prophet Zachariah, then it is an Islamic name. Both prophets Isac and Zachariah are among the prophets that Muslims believe in.
Zak Bagans facebook name is zak bagans
Avenir Zak's birth name is Zak, Avenir Grigoryevich.
Zak Sobel's birth name is Zachary Kantor Sobel.
Zak Spears's birth name is Khristofor Lawl Rossianov.
Zak Orth's birth name is Adam Zakary Orth.
Zak Meyers's birth name is Charles Zachary Meyers.
Zak Bushey's birth name is Zachary David Bushey.
Zak Hair's birth name is Zachary Michael Hair.
Zak Knight's birth name is Zachary Adam Knight.
Zak Ludwig's birth name is Zachary C.H. Ludwig.
Zak Kilberg's birth name is Zachary Arin Kilberg.
Zak is a nickname for Zachary, which is Zekharyah (זכריה) in Hebrew.