You recently got married and the username on your Facebook page no longer matches your new name. You can solve this problem with simple tricks.
Steps

Step 1. Visit the Facebook home page in your browser
If your data is not saved for automatic use, enter your username and password.

Step 2. Click on the icon that looks like a down arrow
It is located right on the blue Facebook strip. Then click on the icon Settings in the drop-down menu that appears.

Step 3. Click on the Edit link
This link is located on the right side of the column titled name in which your name is (maiden name).

Step 4. Change your maiden name to your husband's name
Do this in the field Last name.

Step 5. Click the Add more names link
You will be redirected to the section IN REGARDS TO where you will find in the second column titled OTHER NAMES the link + Add a nickname. Click on this link, then click on Pseudo. In the drop-down menu that appears, you will see the option Maiden name. Select this option and put your maiden name in the box provided. For example if your maiden name is Christine MARTIN and your husband's name is BERNARD, do not enter Christine MARTIN-BERNARD. Just enter this box (name) Christine MARTIN.

Step 6. Click on the Save Changes icon

Step 7. Enter your password in the box provided
This is your current Facebook password.

Step 8. Click Save Changes once more
So you will be done. Your contacts on Facebook can find you either through your maiden name or spouse name.