Most of my family history is based on the Victorian pedigree of the late 19th century when everybody who was anybody got their genealogies researched and published. Queen Victoria thought it was the exciting thing to do, but suggested strongly to her genealogist, Rev. A.B. Grimaldi, M.A., that her desire was to find ancient Jewish ties to King David, et al.
In 1877, he published the pedigree dutifully. Since then, genealogists have poked a few holes in the pedigree suggesting that it was published as Victoria wished it to be, not as it was. Still, it is the best evidence we have connecting the British royal family with the Davidic lines.
If we accept the Victorian pedigree as valid, there are currently some interesting Islamic connections made between the Davidic lines and the relatively recent British royals <https://www.newsweek.com/queen-england-descendant-prophet-mohammed-newspaper-claims-883512>.
To some this might be concerning, but for others, it is cause for some pride.
As my own British royal connection is similar to that of Prince Harry's wife, Meghan Markle <https://www.americanancestors.org/uploadedfiles/content/features/meghan-markle-chart.pdf> (through The King of England Edward III to The Prophet Muhammad ibn Abdallah, Kind David and, ultimately, to Adam and Eve), I am, therefore, a descendant of Muhammad through his grandson, Shia Imam III Husayn ibn Ali. This makes me a Sayyid, however casually, as I am a Christian.
So, I amn't quite what you were looking for, Ahmed, but I am an Aspie Sayyid. Sorta, kinda.
Oh, bother. This always happens when I look into my Islamic ancestry.
...Now, I want some Arab cuisine for lunch!