A phonetic spelling variation of Zachary (meaning “the Lord remembers”) for parents who don’t want to risk someone ever calling their kid ZATCH-ary.
Zac (or Zak or Zack).
Famous people named Zackary:
Baseball player Donald Zackary "Zack" Greinke; football players Zackary DeOssie and Zackary Bowman; TV producer Zackary Drucker; actor Zackary Arthur.
This spelling of the name is rarely seen outside of the United States.