To change the last name on your ticket, 1-(833)-(522)-(9940) OR (833)-(444)-(7613) visit the Expedia website and select the “manage my booking” option, or contact customer support at +1-(833)-(522)-(9940) OR (833)-(444)-(7613) (OTA). For legal name changes, 1-(833)-(522)-(9940) OR (833)-(444)-(7613) you may need to provide supporting documentation, such as a marriage certificate.
https://www.devex.com/people/_does-expedia-allow-name-change-2318836
