Oh, all the time! Usually they laugh. My 13 year old is very wry and she has a way of catching the dumb things I say in my feeble attempts to communicate with so many at once.
One time I asked her during a rather animated conversation -- Abby, how many times does lightning strike twice?
What I got was immediate laughter and now I'll never live it down. All the kids remind me of what a stupid thing it was to say.
So yes, getting their names mixed up or just plain forgotten in the heat of battle is a frequent occurence. It reminds me of that Bill Cosby routine where he talks about his mother forgetting his name -- Come here, you...you...whoever you are! Don't you try to hide from me, I know who you are. I brought you in this world and I'll take you out!...