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.
Pythagoras
Pythagoras wife is Theano.
Pythagoras theorem
Pythagoras education was mathematics and was taught by other people
Yes, it's called Pythagoras theorem
Forename Author Surname has written: 'Title'
The forename Andrew originated in Greece. The name means strong or manly in Greek.
An example of a forename is "John" in the full name "John Smith".
It is your first name.
Ffion
Minerva
James
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This forename, in Irish, is Larry.
The forename "Lascel" is of Old French origin and means "small fortress" or "fortified town." It is a unique and uncommon name that may have Norman roots.
Pythagoras was called "Pythagoras of Samos" because he was born in Samos.
Pythagoras of Samos