Ok I just have never gotten this -
I have many cousins that "share" names. Some actually share them being they are named for the older on or a common ancestor. Others are on completely different branches. Still I know who people are talking about without clarification almost every time. Previously it was "little" first name was used. My Dad and Aunt HATED that convention and put an end to it.
We have 'family' names on my side as well as my husbands, and I refused to use them. I was informed when I was expecting my son (about 7 months on) that there was a family tradition - each first son alternates between John and Joseph in DH's family. DH is the first son, I was expecting our first son and he *should* be named Joseph. He's not. We already had a name picked out at that stage, and my husband hadn't realised that the tradition went any farther than him being named after his father's father. I really wanted to avoid them having the same name as somone, it's just confusing.