User blog comment:IamJakuhoRaikoben/Chapter 468: Memory of the Stars, Review./@comment-25723629-20160110035944/@comment-9595671-20160110043029

I think I can explain that, sometimes the husband takes his wife's name due to reasons such as the better familiarity with the wife's surname.

So I'm assuming that Jude took his wife's name, considering what the chapter revealed, I think she atleast told her about her family name and their mission.