Yes of course, once the booking has been confirmed you can ask for their names so you know who to expect.
I specifically ask for some information prior to booking since Airbnb only verify the main guest and I do clearly state that although one of my listings is an instant booking, where there are two people, the main guest must tell me a bit about the other person prior to booking. I've only had one person ignore this rule and he had to cancel the booking; once a booking is confirmed, I ask for the name of the other person so i know who to expect.
BW, Ama