I do last names too, like for example, If Meza Uppleware marries Rapo Sander, the kid( s) become Sanders, So they usually inherit their father's last name but sometimes their mother's, These are the last names I use:

Sander
Uppleware
Tolstoy, or if female, Tolstoya
Jones
Awen, female Awena
Goldyson

And always, there's a royal family, so King or Queen or Prince or Princess counts as a last name, like Prince Raku.