In the left-hand navigation panel, find and click on "People and sharing," then select "Your name. Enter your first and last name in the provided fields.
Update Name Microsoft 365 Profile Display
This change is synchronized across Outlook. Updating Your Name in Outlook and Microsoft 365 Microsoft Outlook, whether accessed via the web interface or the desktop application, provides a straightforward path to modify your display name.
This guide focuses on updating the display name, which is the safe and recommended method for most scenarios. Select "View profile" from the menu that appears.
Update Display Name in Microsoft 365 Profile
Click on your current name or icon in the top navigation bar. Conversely, the username is the unique identifier that comes before the "@" symbol.
More About How to change name on email
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