Quick answer
Tatum is a boy/girl name meaning "Tata's homestead".
Meaning and history
From an English surname that was originally derived from a place name meaning "Tata's homestead" in Old English. It was brought to public attention by the child actress Tatum O'Neal (1963-) in the 1970s, though it did not catch on. It attained a modest level of popularity after 1996, when it was borne by a character in the movie Scream.
Notes and context
Usage: english