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…
This is definitely off topic: I really dislike the latin plural rule, that some misguided but powerful people decided on centuries ago. "Indexes" is much more natural English than "indices", and we should, when possible, use those those forms.
I don't think a particularly convincing reason was advanced other then "technical things are more Latin-adjacent".