harry potter - Are there any real people mentioned in the Potterverse?

In HP is there ever a mentioning of a person that exists or did exist in reality? I'm looking for specific persons (e.g. George Bush) not titles (e.g. President of the USA).

Answer

• JK Rowling has specifically said that the Nicholas Flamel in Harry Potter is the real person:

Nicholas Flamel is in the book 'the Da Vinci Code', did you get his name from there?

No, Nicholas Flamel is a historical character. Flamel lived in France in the fourteenth century and is supposed to have discovered how to make a philosopher's stone. There are mentions of sightings of him through the centuries because he was supposed to have gained immortality. There are still streets named after Flamel and his wife Perenelle in Paris.
_{(old jkrowling.com)}

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Nicolas Flamel was a real person. I read about him in my early twenties when I came across one of the versions of his life story. It told how he had bought a mysterious book called The Book of Abraham the Jew, which was full of strange symbols and which Flamel realised were instructions on alchemy. The story went that he subsequently made it his life's work to produce the Philosopher's Stone.

_{(Pottermore - Nicholas Flamel)}

• She has also said (while under oath) that Paracelsus is a real person.

“I would not go that way if I were you,” said Nearly Headless Nick, drifting disconcertingly through a wall just ahead of him as he walked down the passage. “Peeves is planning an amusing joke on the next person to pass the bust of Paracelsus halfway down the corridor.”
“Does it involve Paracelsus falling on top of the person’s head?” asked Harry.
_{(Harry Potter and the Order of the Phoenix - Chapter 14)}

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Several of incidental wizards and witches that I mentioned within world of -- within the novel, Harry Potter novels, were believed to be real. Or certainly were real as in the case of Paracelsus.
_{(JK Rowling's testimony at Warner Bros vs RDR Books)}

• Many other names of real historical people can be found on the chocolate frog cards:

“Oh, of course, you wouldn’t know — Chocolate Frogs have cards, inside them, you know, to collect — famous witches and wizards. I’ve got about five hundred, but I haven’t got Agrippa or Ptolemy.” (...) he had not only Dumbledore and Morgana, but Hengist of Woodcroft, Alberic Grunnion, Circe, Paracelsus, and Merlin.
_{(Harry Potter and the Philosopher's Stone - Chapter 6)}

Q. Let's put on the screen Exhibit 34. Can you please tell the Court what Exhibit 34 is.
A. This is a list of the famous wizards, well, fictional famous wizards, and their achievements and dates of life and death -- of birth and death, that I provided to Electronic Arts.
Q. Did you make these wizards up?
A. I did. Occasionally there is someone who existed in reality. I've taken some liberties with their biography.
_{(JK Rowling's testimony at Warner Bros vs RDR Books)}

Thus Angus Buchanan became world-famous among wizards whilst also being celebrated among Muggles, a hitherto unknown achievement.
_{(Pottermore - Scottish Rugby)}