What is Pythagoras forename?

Answer 1

That was his forename. His name was Pythagoras of Samos. He was an Ionian Greek Philosopher/Mathematician and founder of the religious movement called Pythagoreanism. Most of the information about Pythagoras was written down centuries after he lived, so very little reliable information is known about him. He was born on the island of Samos (where he is named after), and might have travelled widely in his youth, visiting Egypt and other places seeking knowledge.