Bedrich Hrozný, who was Czech BTW.There are some examples however, that point out the common origin of all IndoEuropean languages.
When trying to decipher a Hittite cuneiform tablets, the word "Waatara" came out. That German linguist, whose name I don't remember ATM, correctly translated it into "Water".
And to answer your question Aemilius Paulus, yes, it does appear that the word for sea in both Celtic and Slavic comes directly from the hypothesized Proto-Indo-European *måri.
I got that from Gerhard Köbler's online PIE dictionary (http://dnghu.org/en/Proto-Indo-European%20dictionary/).
It's in German, which I don't speak, but it's something very interesting to have nevertheless. If someone konws what I gave to be incorrect then please do correct.
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