Zack (and variant spellings Zach, Zac, Zak, Zakk) is sometimes a given name, but more often it is a hypocorism or short form of another given name, usually Zachary in the English speaking world, which derives from Zechariah.
This page or section lists people that share the same given name. If an internal link led you here, you may wish to change that link to point directly to the intended article.