One and a half hours ago, American mixed-race actress Meghan Markle became the wife of Henry Windsor (1984), commonly known as Prince Harry. 11:40 a.m. GMT, which conveniently meant it was Saturday in nearly all the world. I've tidied up some of Meghan's ancestors' articles but there are a few more to be started!

Big question now - do we change their page names so as to mention the fact that Meghan is now Duchess of Sussex and Harry's her Duke?

Well, we certainly don't add "Duchess of Sussex" tp her page name, because that is just a married name, not a title in its own right. Thurstan (talk) 21:47, May 19, 2018 (UTC)
One Wikipedia contributor has stated: "On the morning of the wedding, the Queen officially conferred HRH Prince Harry of Wales and Ms. Meghan Markle the royal titles of Duke and Duchess of Sussex. The formal and correct way to refer to Her Royal Highness is now Meghan, Duchess of Sussex. " - so I suggest that we do a bit more study of the press releases from Kensington Palace or similar sources. -- Robin Patterson (Talk) 11:16, May 21, 2018 (UTC)
Taking my own advice I found - which (not actually backing up that WP contributor) says:
"The Queen has today been pleased to confer a Dukedom on Prince Henry of Wales. His titles will be Duke of Sussex, Earl of Dumbarton and Baron Kilkeel.
"Prince Harry thus becomes His Royal Highness The Duke of Sussex, and Ms. Meghan Markle on marriage will become Her Royal Highness The Duchess of Sussex."
(Interesting use of capital "T" there.) Harry was presumably already Earl of Dumbarton, but we didn't put that into his page name. In view of the way living people can change their titles, maybe our general rule should be that we don't put titles in their page names unless they are monarchs or others whose titles can't be improved upon? We certainly show them in the short and/or long name and use redirects (as I have just done for Meghan's new WP name), and that could be enough.
-- Robin Patterson (Talk) 11:35, May 21, 2018 (UTC)
Are you really saying that you expected the queen to create the same title ("Duke/Duchess of Sussess") for two different people? The rules for British peerages do not allow that! I consider her titles a "courtesy title". Thurstan (talk) 20:17, May 21, 2018 (UTC)
I am certainly not saying that, although several WP contributors seemed to be. Clearly the royal website was indicating that Harry has been made a duke and that his wife will therefore be known as a duchess - a "courtesy"title" if you like. Getting back to the page-naming point, how many courtesy titles do you think we might already have in FP page names? Should we firm up the relevant policies? -- Robin Patterson (Talk) 05:05, May 22, 2018 (UTC)