I found out that youmay find the same names of children in the family , is because some people named another child in memory of the one that passed away. So there may be two Joels, or two Marys,etc..Check the years between one of the children and the other. Or they just may have wanted two named the same for their own reasons. It was hard for me to think of the same two names, but someone told me about two children with the same name, because one died in infancy so they named another child the same name in memroy of the fitst child that had passed.
I saw a post where someone was wondering about two having the same names and it made me remember when I was wondering about the same thing.