Controlling Personal Identifying Info and assigning an automatic user number

I want to host a meeting that will have people register to attend.  I DO NPOT want the participants private compromised but do want to assign them a special "user number" displayed on the screen.

So, 40 people register for the Zoom event/meeting

When they log in, they are automatically assigned a user number that show up on the screen instead of their actual identifying name.

Anyone have any ideas?

Thanks in advance!

Sanjay