I always do. but now I made up the last names ; Blue, Lopez, Hutchinson, Sander, Jones, and Terexun( Terexuna if female) there used to be Uppleware and Goldyson but that family died out. What I do is I mate the parents, then when the kid comes out I look at his dad's last name and give it to the kid. Sometimes I give the kid his moms last name or make one up

Did you get Katarina from the book by Kathryn Winter?