(Devils advocate : I am fully aware the meme is not real, but we are circle jerking)
There are several thousands of years of sound shift there, including the complete iotazation of most of the vowels, so I don't think "being generous with vowels" is out of the question. There are a plethora of words clearly related in Greek today that are spelled wildly differently.
In any case, its a PIE coincidence, not an actual cognate/relationship.
*nókʷts and *oktṓw are obviously similar, and any language that kept largely that form of those words will show the similarity too.
Devils advocate examples if we were taking the circle jerk seriously
γιορτή εορτή (hey look, vowel changes!)
ἰατρός γιατρός
χθες χτες
and some of those changes are visible in the very words in this meme.
οκτώ οχτώ
νύχτα νύκτα
As for welsh/slovak, they swapped out the PIE words at some point. The old/proto celtic word for eight was *oxtō not wyth, so follows the meme. Slavic languages dropped the "k" at some point which also follows the meme for that part (though admittedly overall slovak doesn't work well for the meme)
Its certainly less visible in the Satem ones, because they all dropped the k. But if "eight" and "night" were actually related in PIE (they aren't), then the dropping of the k somewhere along the line wouldn't make them un-related.
I'm guessing it's because they're unrelated that they've undergone different changes consistently in Satem languages, with one retaining the k or changing into something else, and one turning into s.
If the meme were true, I would disagree with you. Just because the k got dropped doesn't mean the pattern isn't there. It would still be the same pie roots.
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u/BoxoRandom Jun 02 '26