I am... and, have the records to prove it. :-)
My g-g-grandmother was a descendant of Sir Thomas Wyatt. Once you link your family in some way to British nobility? You're connected back a LONG way.
So... yea... pretty much all of us with European ancestry are.
King Tut was thought to be Irish at first but further study showed that he is related to half of the males in Europe. When you are related to one member of the royal family you are related to most of the Royalties of Europe.