What the display name is used for
The display name is the name the other side sees. It appears in your conversations, and in the notification sent to a host when you book their space.
It is between two and sixty characters. You may leave it empty, but then the host sees a booking with no name, which makes it harder for them to know who is coming.
You do not have to use your full name. It is worth choosing a name a real person will recognise, because that is exactly what you are asked when you meet at the place.
The display name is not an address and not a phone number. Contact details stay hidden until the booking is confirmed.