User blog comment:Crazywarfire/My Dishonored Theories/Explanations./@comment-84.140.58.19-20130809203417/@comment-6301921-20130810003609

Lady Boyle kept her maiden name, so it could be that in certain situations, a man will take the woman's last name, especially if the woman has more power or her name is more notable, which is definitely true in Jessamine's case.