It's not about copyright. You don't copyright a name like that. You copyright an original, creative work. You could (probably) copyright a core design, that' s a creative undertaking.
You're thinking more of trademarks. As far as movies are concerned, another studio would have a difficult time making a movie about a dragon-oriented apocalypse and call it Reign of Fire. There is potential for confusion between the two movies.
With a movie and a bowling ball, both called Reign of Fire, there's practically no possibility of confusion. Those are two completely different markets. MGM (or whoever) can own the trademark "Reign of Fire" related to movies while Storm owns the trademark "Reign of Fire" related to bowling balls. Brunswick probably would not be allowed to develop, say, a core called "Reign of Fire" or release a line of flame-pattern shoes and call it "Reign of Fire". Those are the same markets and a reasonable consumer could be confused and think that Storm made the shoes or Brunswick made the ball.
Furthermore, names generally aren't trademarked at all unless there's a really good reason to. There are a lot of movies with the same name, tons of similarly named songs, and a lot of books share names. Either the more recent creators have negotiated to use the name from a previous (or original) creator or there simply isn't a way to declare a name "yours" without going through the full trademark process.
SH
