After a little research it seems that “octopi” and “octopuses” have been so widely used and for so long, that dictionaries include all of them as correct. An article from merriam webster even pragmatically suggests referring to them as “octopodes” is less likely to be understood so stick with “octopi” or “octopuses”. Also, it seems “octopodes” is the more widely accepted “correct” plural and “octopoda” refers to the genus.

But it’s an interesting topic, i wish to subscribe to octopus etymology facts(or any interesting reads)