I personally like the idea of a shared middle name.
In my family, ALL of us girls have my grandmother's name as our middle name (Marie). My mom, all four of her sisters, each and every one of the female children down to the great grandkids.
My husband is one of 10 children. 6 girls and 4 boys. Every last one of them has the same middle name: Their mother's maiden name. It was her idea of not hyphenating the kids' names, but retaining her maiden name. I don't like that at all. My child will NOT follow that tradition. And it's not a very femininely flattering name for the girls. It's quite ugly. No thanks.
But on the other hand, I am in LOVE with the idea of using the masculine form of your name for your baby's middle name. I think that is just a wonderful idea!