bob jenkins wroteWe all hear our name better than we hear our role ("ref", "coach"). So, using the name can help us get the attention through the noise / distractions of the game.
Put me down on the side of using the name (on both sides).
I also try to remember the captain's names throughout the game.
Can you understand the kids when they mumble their names to you? I know half the time I can't, especially with some of the more exotic names. I do try to remember their numbers, though -- just in case I don't, I circle the speaking captain's number in the book.
And I do (maybe someone has a mechanics manual handy at the moment can verify whether this is still in there) verify before the toss that the captains are ready (speaking for their teams).