Is the app name subject to copyright?

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http://stackoverflow.com – I'd appreciate anyone's advice on this. We have an game on the app store, which we heavily promoted running up to the release with a trailer etc. We have been developing the android version but have now found someone has released a cheap Android game with exactly the same name and therefore is riding off our publicity? Everything is different about the game, apart from the name. Can I get this app taken off the store? As it is blatantly ripping us off! Do game names come under copyright laws? Cheers (HowTos)