When my wife was pregnant with our first son, I suddenly got curious and looked up our family trees on familysearch.org. I actually bumped into Charlemange in the tree accidentally! I went to work and started bragging to a couple of French co-workers who laughed and told me this was the joke in France: One in two people can verify they're direct descendants of Charlemange. The other half just don't know it yet.
"Who Do You Think You Are" had an episode with Cindy Crawford where she found out she was a direct descendant of Charlemagne, and they made a big deal out of it (https://youtu.be/iA_UYcGDhYw?t=307).
The website of the genealogist mentioned in one of the citations goes into more detail of who you are very likely related to. For instance, if you are a human, you are almost certainly a descendant of the Old Kingdom pharaohs. If you're a European, you're more than likely a descendant of Mohammed the Prophet as well as Charlemagne. However, this is genealogical descent, not genetic descent; genetic ratio is different (but dealt with in the OP).
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[ 3.4 ms ] story [ 17.9 ms ] threadhttps://en.wikipedia.org/wiki/Charlemagne:_By_the_Sword_and_...
http://humphrysfamilytree.com/ca.html