Why was "tantrum" trending last week?
c.1300, "inscription, heading," from Old French title (12c.), and in part from Old English titul, both from Latin titulus "inscription, heading," of unknown origin. Meaning "name of a book, play, etc." first recorded mid-14c. The sense of "name showing a person's rank" is first attested 1580s.
"to furnish with a title," late 14c., from title (n.). Related: Titled; titling.