Yeah

Making the us into an i for plurals happens in English when you need to make a word ending in us that comes from a Latin root plural, like radius to radii. Originally it was thought that octopus came from a Latin root, so that’s what English speakers did. But it turns out that octopus actually isn’t from Latin, it comes from Greek. For Greek words, you wouldn’t change the ending to i in English, you’d add the ending podes, making octopus into octopodes

But some say that octopuses is better because octopodes is a bit of a mouthful, and the usage of octopi has been prevalent enough that adding the standard us ending sounds in English is easier and better in the long run. Or so I’ve gathered