Not sure if this will be considered off topic, my apologies if so.
The article says that octopi is the plural of octopus, but it's actually octopuses. Octopus is originally Greek, not Latin and thus does not get the Latin plural -i, but instead would get the Greek plural -odes. Since it ends in a way English can deal with, the commonly accepted usage is octopuses (English) over octopodes (Greek) with octopi being the least correct.
The article says that octopi is the plural of octopus, but it's actually octopuses. Octopus is originally Greek, not Latin and thus does not get the Latin plural -i, but instead would get the Greek plural -odes. Since it ends in a way English can deal with, the commonly accepted usage is octopuses (English) over octopodes (Greek) with octopi being the least correct.
https://qz.com/1446229/let-us-finally-resolve-the-octopuses-...