Board Thread:Show-Related Questions and Answers/@comment-34924658-20161007034751/@comment-1894786-20161007044715

Nope. And it's also uncommon, but still possible, for husbands to take their wives' last names. Knowing how dominant Cora was, it wouldn't surprise me if Henry was forced to take the Mills family name. It also would explain why she wouldn't become queen, as taking another family name would be equivalent to abandoning any hereditary claim to your own family. They were still allies in battle and were still kin, but you were no longer part of the family.