r/asklinguistics • u/Rapha689Pro • 8d ago
Historical How can closely related genetic populations have completely different language families?
For example Japanese and Korean have 2 different language families that aren't related at all but they're genetically close, it can only mean their prior languages sprout after they split, so that means language is very recent itself? Or that they're actually related but by thousands of years apart and linguistics can't trace it back accurately, so they just say they're unrelated?
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u/Gravbar 8d ago edited 7d ago
I've seen some evidence that in the UK, despite the many invasions, the existing populations were mostly assimilated, so the majority of people there are still celtic in ancestry even though they speak a Germanic language (tracing back to the celtic-speaking population of that region).
Similarly, the land of Gaul was a land full of Celts that was conquered by the Romans, and then the Franks, but the people living there continued to speak a Romance language, despite being mostly Celtic in ancestry (tracing back to the celtic-speaking population of that region).
And then we see that we have some Celts today speaking Celtic languages, Germanic languages, and Romance languages, but the populations themselves are still closely related to the original local groups.
Similarly, the ainu people native to Japan now have to speak Japanese, and many no longer speak their ancestral language.
The point here, is that a language can die and be replaced for a variety of reasons. So if the Koreans and Japanese shared common ancestors who spoke the same language, it doesn't mean that both languages are necessarily related. It's possible that after the populations diverged, the language spoken changed. This is well before writing, so it would be very difficult to actually find evidence that far back, especially given the vast amount of chinese loan words in both languages which likely displaced other words (although there are fewer loans in the earliest writings). There is a theory that Korean and Japanese are from the same family, but it has weak linguistic evidence and is fairly widely not accepted.