Most users of GenoPro use the 'Family Name / Maiden Name / Surname' field to record the birth name of that person, and then use the 'Second Last Name' field to record any change in the last name - eg by marriage.
The 'Full Name' then controls how that person is represented in the report, and the 'Display Name' how that person is shown in the Genogram.
The default arrangement of these fields is controlled by the Display tab of the properties, but you can edit the content of these fields on the General tab to show anything you like - you are not limited to the options shown in the drop-down menus.