You can change your Display Name in Zoom either temporarily during a meeting, or persistently by updating your Zoom Profile information.
To make a persistent change to your Zoom Display Name, it must be set in your Zoom Profile using the Zoom web interface.
To make a temporary change to your Display Name during a Zoom meeting, simply right-click on your “self-view” video box, and select Rename from the menu. In the next window, type in your preferred Display Name, and click OK to save. This Display Name will remain active during the active meeting.