Brain - Pre-Norse people created another word. I found only heili, heilir in the Old Norse,
besides of the Indo European hjarna. They look similar, that is why heili is maybe a PreNorse-influenced variety, but I think it is related with Latin calva, "brain pan".
English brain is related with the German slang-word Birne. Because it contains b-, I thought it
constitutes a Pre-Norse word but it is only Southern Germanic. It could be a word of the PreSaxons.
A distinct related appearing word to brain is Turkish beyin. But perhaps Turkish b- was preTurkish m-. There is no evidence if pre-Turkish b- stayed or shifted in another pronunciation.
I think it is improbable.
In general, Ancient Greek βρεχμός (brekʰmós), „fore-part of the head“ is given as one
relative.This makes sense because the pre-English word was presumably *biragana. But in
opposite to the German word it constitutes a male word.
In the Basque language exists burmuin. It is certainly related. Basque people are mostly
haplogroup R1b and the next in size is haplogroup I2. So, I think the English word stems from
haplogroup I2.
Finnish includes aivot. It matches with Southern Sami aevsie, „forehead with horn“.
Mandarin 脑袋 nǎodài and Japanese nō aren’t related. It is apparently not a Uralic word.
But aivot could be an inverted Pre-Norse word to Arabic dimāġ, I thought. The Prime Arabic
root was *djmjgʷ and for the Finnish word I calculate a Pre-Norse primordial root *dwmj-.
But I think it is not probable. The Finnish prime root was *ʔajw-.
Another descendant of the Finnic root is Pite-Sami vuojŋanás. Assuming the -jŋ-part belongs
to the root it is perhaps the -j-part of the calculated root. The ʔa- part of the root lacks.
So, the Pre-Norse root consisted of three unknown morphemes in shape of *ʔa-jŋ-ww.
Arabic muxx and Hebrew moħa, "brain pan" are related with Slavonic languages, Russian
мозг (mozg) and Serbian мőзак, for example. The prime root for Arabic was *mukʲkʲ and the
Slavonic root was *mugʲk. The Hebrew root is located more aloof. In a strict sense it matches
only in the mo- part. Is this the word of Y-haplogroup I2? Look also at -->brain pan.
Basque supports an Indo-European word, garunak, compare Latin cerebrum and Sanskrit
gorda. Northern Sami jierbmi is related too.
The Indo-European root is *kerem-/*korom-. You could suppose a relation to the Semitic
languages if you regard it as inverted.