There's a mathematical relationships search. It will tell you, for example, that academically, Max Noether is the first cousin of Emmy Noether. (Both of their advisors were students of Jacobi.) But Michael Artin and Emil Artin aren't even related.
It's less amusing, of course, when you search for people that aren't related in the standard way. But Paul Erdos is my great-great-great-great-uncle. (You can't search for me yet in the Mathematics Genealogy Project, which is where the data comes from; the link goes to the relationship between Erdos and another student of my advisor.)