Yiddish is basically high middle german. It has some hebrew loan words. Hebrew is not an indo-euro language though, it's a semetic language. Egyptian is not believed to be Indo-european or semetic.
Actually there is no smoking gun one way or the other. They are, however, very closely related. And is more than likely that Hebrew is the precusor for Yiddish. Though as I said, no smoking gun one way or the other.
Edit: And more modern research is tying ancient egyptian to Yiddish, Hebrew, and Welsh. The Welsh tie in, in turn, ties back to Tribe of Dan. Which in turn has ties to Greeks, Romans, and many Scandanavian countries, and so on.
I'm no language expert, but I have spent a fair amount of time on the subject. I've always read that yiddish is based on high middle german and that it has heavy hebrew influence, but you're right, deciding which is the base language and what influenced it can be a matter of judgement. Given that yiddish is the language of the ashkenazi and that they arrived in central europe around the time of the khazar collapse which was the middle ages, I figured the theory that it's based on middle aged german makes sense.
As for welsh, I learned that it's a dialect of gailic which is definitely Indo-european as the celts were basically an earlier wave of germanics, originating from the same place.
Supposedly proto-indoeuropean and proto-afroasiatic came from the same place though. There are supposedly 300-400 root words with the same sounds and concepts. Afro-asiatic would include things like canaanite, egyptian, arabic, and akkadian.
Interesting topic, thanks for bringing it up.
Will freely admit I'm no language expert either, but I'm getting my information from an expert who is also an anthropologist. My focus has largely been on Aryan origins which has taken crazy turns, including the origins of Jews and the biblical tribes. The anthropologist has presented standardized charts showing the etomology of language. Yiddish is definately the predessor language to Old German. I believe middle German follows Old German. Meaning Yiddish -> Old German -> Middle German -> ... Regardless, these general topics (history) are something I've been working on for decades. Though the Aryan topic is much more recent. That said it has tied into much other origin research with little conflict.
As for the Askenazi, they would use whatever is required of them at the time. Personally I find them largely irrelevant for language origins. Though feel free to disagree. You may find the link I shared with others here of interest. Read all comments and find the link I repeatedly shared. Here is something to think about with the Ashkenazi. At they time they declared themselves Isrealites, no one raised a brow that a large group of Caucasions declared themselves Isrealites. This will feed back into the link I mention above.
As a side note, as for the ancient Egyptian language ties, even some Jews are recently making these claims to Hebrew. Yiddish <-> Hebrew has commonalites. You can see where this goes.
Latly, I would like to say thank you for disagreeing so politely. Much appreciated. Even if we continue to disagree, I'm happy to return the respect.
Cheers
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