The order of names will be:
You will always see moderators/administrators listed first.
The default sorting will be users with cams, first registered users, then guest users.
You can change sorting to "roles" which is registered users, followed by guest users.
You can change sorting to "username" which is A-Z.
You can change sorting to "age" which is youngest to oldest.
As new users enter, they will be at the very bottom of the listing.