Yes, I am. Lots of them too.
In my genealogy, I have Benedict Arnold, a third cousin to my 4th great grandmother. Aaron Burr, Jr., Vice President of the United States under Thomas Jefferson, and who killed Alexander Hamilton in a duel, was a 5th cousin to me. Roger Conant, the founder of Salem Massachussetts, is my 9th great grandfather. Grover Cleveland, 22nd and 24th President of the United States is a distant 4th cousin. Nathan Hale, is a cousin in the family line of my mother, as is Diana Spencer, the late Princess of Wales. Diana's maternal grandmother is a 2nd cousin to my mother. Frank Gifford is a 6th cousin.
It seems I am a direct descendant of the Plantagenet King John of England (my 21st great grandfather), the one who signed the Magna Carta, under threat of death, and who was the brother of Richard the Lionhearted. John is also famous for being Prince John at the time of the Robin Hood tales. So.....another "not so good guy". I can also claim King Henry II and his wife Eleanor of Aquitane (parents of John and Richard), William the Conqueror (famous for defeating King Harold at the Battle of Hastings and was my 25th great grandfather), as well as the ancient Celtic warrior-kings of Britain, like Cerdic who was born in 455, Egbert born in 775, Aethelred II, born 968, etc, all of whom have descendants in current royal houses of Europe. Queen Victoria was a 14th cousin of mine, and the current Queen of England, Elizabeth II, is my 18th cousin, so not a close relationship.
But, here are the true facts (a quote from my genealogy web site): According to the book "In the Blood: God, Genes, & Destiny", 25% of the population of Britain is descended from William the Conqueror. Consider you need two parents, four grandparents, etc. Assuming an average of about 25 years per generation, you only need go back to 1200, quite within historical times, to need more separate ancestors than the population of the world.
Therefore we all must descend from cousin marriages, many times over, even within the last few hundred years. Davenport claimed "no people of English descent are more distantly related than 30th cousins". So if you go back in time far enough, nearly everyone with English ancestry is going to find some bits of royalty, so I am not unusual, in that regard.
Another man I am related to is Wyandanch, Grand Sachem of Montauks (high chief of the Montauk Indians). He lived 1571-1659, and was my 9th great grandfather.