If this includes only adult family members, mine comes awfully close. Does it have to be a published book or can it be any topic? I used to write for NPR and my mother is a (soon to be) published author. There are less than 20 adults with my last name in the world.

My case is helped due to the lack of males on my father's side of the family.

Granted, I probably fall into the "special rare case" category. Its a cool thing you have nonetheless.