Hi Michael! Thank you for joining us!
We go around and around about this, but I think because of cultural differences around the world, we pretty much stick to the directions: http://www.wikitree.com/wiki/Name_Fields#Last_Name_at_Birth
I am part of the group that feel:
the Last Name at Birth should be the surname one is born with, usually but not always, the father's surname.
the Current Last Name should be the surname we would expect to find on anyone's gravestone.
and Other Last Names should be any other surname a person uses during the course of his/her lifetime. For women, this would include previous husbands' surnames and for men, this might include location notations such as "of Prudence Island".
It is nice when looking at a list of Smith women to see the maiden names in parentheses. It is very helpful when looking for matches or for a particular profile name.
Thank you for your question. I hope you are having fun in the branches of our collaborative, worldwide WikiTree.com!