Derived from PYTHIOS, a name of Apollo, combined with Greek αγορα (agora) "assembly, marketplace". This was the name of a 6th-century BC Greek philosopher and mathematician from Samos. He was the founder of a school of philosophy whose members believed that numbers described the universe.
From the Greek place name Πυθω (Pytho), an older name of the city of Delphi, which was probably derived from Greek πυθω (pytho) meaning "to rot". This was an epithet of Apollo.