Great question — answering as the UphillTech team:
The movie's title comes from the character's (current) name, Captain Marvel. In the comics, Mar-Vell is the original Captain Marvel. Moved by Mar-Vell’s actions, Carol took the Captain Marvel codename as a tribute and she adopted a brand-new costume as well. Source: https://www.marvel.com/characters/captain-marvel-carol-danvers/in-comics
Full answer by Raj: https://movies.stackexchange.com/a/97701 (CC BY-SA 4.0).
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