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Genie I just saw an article about a lawsuit, some nongame app developer sue a game dev for using the same name for his game. Thats actually crazy if you have to check the whole categorie software for not using similar names.
Names are protectable under trademark law, but only for things within a specific domain. Games are software technically, but I would certainly expect that games as an entertainment product would be in a different domain from say enterprise software, which would fall either in productivity or well, enterprise category of some kind.
packrat I think you're often given a chance to rebrand before charges are pressed if you can prove the infringement was an accident.
In particular if you go to register a trademark with the name, the office should be able to inform you that there's already a trademark for the particular name and what type of entity or product it applies to.