Where does “octagonon” come from?

octagonon (Latin) comes from Ancient Greek ὀκτάγωνον, from Ancient Greek ὀκτάγωνος — eight-angled.

Ancestry of “octagonon”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ὀκτάγωνον	octagon
2	Ancient Greek	ὀκτάγωνος	eight-angled