Was thinking about this earlier as there was a poster the other day wanting a flower name for her second dd to go with her dd1's flower name. I thought ... hmmm, then realised that my kids' names "match" in the sense that they are all gaelic!
And I once knew a woman with three girls called Sharon, Tracy and Clarissa, which I thought was a little strange ...
However your siblings are only with you on a daily basis during your childhood, and for the most part of your life you will not be living with reference to them ... so how necessary is it really?
Just interested in your thoughts ...