I've been trying a little tactic to keep close matings down. When a child is born, I take the first three letters of the mother's name and the first three letters of the father's name to make a "last" name for the child. Some of the combinations got funny. I had a Panfuj, an Atebob, and a Kankan. (The first name of the Atebob child was Kayak, so Kayak Atebob. Weird, huh?)