Wikipedia has this to say on the plural of "octopus".
Please note, I am not apprehensive, although I feel I ought to be.
The Oxford English Dictionary (2008 Draft Revision)[38] lists "octopuses", "octopi", and "octopodes" (in that order), labelling "octopodes" 'rare' and noting that "octopi" derives from the apprehension that octōpus is a second declension Latin noun, though it is not. The book further maintains that if the word were native to Latin, it would be third declension octōpēs (plural: octōpedes) after the pattern of pēs ("foot", plural pedēs).[39] The original Latin word for octopus and other similar species is polypus, from Greek polýpous (πολύπους, "many-footed"); again, usually the inappropriate plural polypī is used instead of polypodēs.
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