Hello SinaMajidi,
I'm Jin, a fellow Windows 10 user and an independent advisor.
I understand that you want to change the name that shows up in your user account.
Since you are using a user account that is linked to your Microsoft Account, you need to update your Microsoft Account to have this data updated.
Settings > Account > Your info > Manage my Microsoft Account.
You'll be directed to a web browser and access your Microsoft Account. Under your name in the Microsoft Account, click More actions then select Edit profile. Then click Edit name and update the name that you want and then save. Restart your device.
The changes you made can reflect on your device after a while.
Alternatively, you can also update this information by:
Pressing Windows key + R, type netplwiz then hit Enter. Click on your user account and click on Properties. Update the Full name field then hit Apply.
Kind regards.