The moniker Captain Marvel has been shared around between four different companies and over a dozen heroes since it was first created by Fawcett Comics. After acquiring the hero from Fawcett, DC Comics put Billy Batson Captain Marvel into print. Since Marvel had their own signature hero, Mar-Vell's Captain Marvel, they sued DC for trademark infringement, citing how the name was linked to their own brand. The question is: Has it paid off?
Source:https://www.cbr.com/marvel-dc-comics-captain-marvel-lawsuit/