I cheat a little bit...I rename all my villagers using names like Kamiko and Tanari and Mekolu and Rosita. All the males have names that end in O or U and the females have names that end in A or I. Then when they have a baby, I use part of each name for the baby. So if Kamiko and Tanari have a boy, his name will be Tamiko...a girl would be named Kanari. A second of each child would be Tanako and Kamiri.