In one of my tribes, I renamed all the children born so that their names were a fusion of their parents names, but by the second generation all the names were sounding pretty much the same and there's no kind of inbreeding penalty (thank goodness!) so I dropped it. I still like to rename twins or triplets so that they match. I renamed Hope's twin as Joy, for example. I don't like two living people to have the same name, so I usually change those, but I don't mind recycling names of the dead - I think of it like a tribute to a beloved grandfather.