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If your question is, "Can we prevent users from changing the Display Name on their Zoom Web Portal's Profile screen", I think the answer is "No". If you are an enterprise account, have your internal Zoom Admin contact your Zoom Account Manager and ask them if there's a way for Zoom to prevent this on the back end. Otherwise, I'd suggest making a Feedback/Feature Request, with some justification/rationale for it.
Note that people might still be able to change their display name once in a meeting - if the host has permitted it.