it is not cute or clever or flirty to repeatedly call after a bartender by his or her first name when you want something. it's just rude. knowing their name, doesn't make you special. if you are liked, they prioritize you as best they can. if he/she glances up at you, makes no note of your call, doesn't crack a smile, and goes back to what they were doing, you're an asshole. that goes double when the bar is busy.
also, don't wave. they hate that, too.