Open the Facebook app or website
Go to Settings and privacy
Select Settings
Tap or click Accounts Center
Select Personal details
Select Name
Enter your new surname
Review the name change
Save the changes
Confirm your password if prompted
Open the Facebook app or website
Go to Settings and privacy
Select Settings
Tap or click Accounts Center
Select Personal details
Select Name
Enter your new surname
Review the name change
Save the changes
Confirm your password if prompted