To change your first and last name in Microsoft 365, you will need to follow these steps if you are an administrator:
- Go to the Microsoft 365 admin center.
- Select Users > Active users.
- Choose the user whose name you want to change.
- To change the user's display name, select Manage contact information. Here, you can edit the first and last name.
- After making the changes, select Save changes.
If you are not an administrator, you will need to contact your admin to request the name change for your account.
For personal Microsoft accounts, you can update your information by visiting the Microsoft account settings page.
Make sure that any changes made reflect what you want displayed across Microsoft services.