The name Zack is a boy's name . Zack and discussed in our forums with posts like "Name Association Game".
From the experts:
As the common short form of Zachary or, more unusually, Zachariah, Zack is less intuitive than Zach or Zac in terms of spelling but clearer in terms of pronunciations. Maybe because it rhymes with Jack and Mack, it also feels more complete as a name. Some people also use Zack and brothers as a short form of Isaac.