Legalitly of naming a bar/restaurant

[guids]

I am opening up a nightclub in 6 weeks, we have everything in place, we just need a name, we have a few in mind, but I dont know the legality of "stealing" a name from a place (out of state). Ie, if I wanted to name it the Stardust, or Peppermill, what is the legality of that? I know when you file the LLC (a diff name from the restaurant) they make sure you arent naming it the same as another person, but what about the actual place? also, any suggestions for a retro 50s/60s name would be cool, free drink if I pick yours and you come in.....