I was just curious so here it goes....

As a huge nerd with tons of fandoms my friend and I in the world we've built have occasionally used names from Video games, comics, shows, books, etc that we've liked because well it's our roleplay world. Do you guys find that you do that too. I made a pretty detailed map for our world, with regional and political borders, but didn't want to post it for fear that the response would be "You stole that." Any thoughts on the matter?