I am distantly related to Charles Stewart Rolls, of Rolls-Royce fame.
And these two, not sure if they are famous or infamous, or neither...
Caroline Pride, Princess Diana's best friend & godmother to the younger Prince is married to one of my distant cousins.
Nicholas Mostyn QC who represented Prince Charles in his divorce settlement, is another distant cousin. I'd never heard of either of them till I started googling their names.

My grt grt grt grt Aunt Elizabeth lived at Highgrove House in the 1800's where Charles & Camilla live now - more a famous house than a person

Minn