According to Zenith’s Official Discord, due to their 3rd Party Vendor (Backerkit). Zenith will be unable to do name reservations. Instead, they will randomly pick one person to receive the name of their choosing.
Now this system that they have devised is extremely taxing, in terms of manual labor. It’s going to be really interesting seeing how they accomplish this for over 1000 people who have so far backed the game.