I happened to name an app I wrote after a kind of Pokemon, it wasn't on purpose. The app isn't a game and has nothing to do with Pokemon. Am I at risk of being sued for copyright infringement?
Pokemon names are trademarks by Nintendo.
Trademarks prevent other people from using names/logos etc. so that consumers dont mistake someone else for the logo owner.
However, the exclusivity that a trademark gives the trademark owner is limited to the industry that the trademark is registered to.
So you cant make a game called "The Pikachu Game", because the name's trademark probably extends to all video games.
But if you make a business app? You might get away with it.
So it boils down to how similar your product is to anything Nintendo makes.