The request for the name during the purchase flow can be linked to the Battelli law, or to technical requirements by the organizer of the event. In both cases, if requested, the full name of the person who will participate in the event must be specified on each ticket.
You can check if your event is subject to the Battelli law by clicking on "Info" in the event page of your interest, as in the images here below:
Example of an event not subject to the Battelli law