Duplicate video game names, legal?

Trying to pick a name for my game and it seems like every possible name is already used. Am I correct to assume it is ok if I pick a name of a game that already exists as long as my game isn't just a copy of that game? I mean, chances are the two games could be similar.. like, if I made a game about balls, I might name it 'Crazy Balls' and of course if another game uses that name it might also be similar, but not an exact duplicate (I'd hope).

I do know about marketing related issues, like best if domain name is available and not too many established Google search results, etc.

I was thinking about "DropZone" as one option. I see there is an old game with that name, not like my game though. There is also a game company with that name.