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).
https://www.devex.com/people/how-to-i-change-my-name-on-expedia-usa-2261303
