Is Japanese "subaru" related to Russian "soberu" ("I'll put together") and Latin "conferre" ("to bring together")?
I think both Latin and Russian words derive from Proto-Indo-European "com bheroa̯" "I am putting together".
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No relation at all. In linguistics the absence of a genetic relation is the null hypothesis. The burden of proof relies on those who claim a certain etymological relation or a common origin of two or more words. So, unless someone proves the relation between subaru and the other two words, the answer is: unrelated.
P.S. Don't let phonetic similarities fool yourself: when two words sound alike this is a good hint of their unrelatedness. Genetically related words usually have different phonetic shapes, as you can witness for Russian soberu (first singular of sobrat' 'to collect', formed by the prefix so- and the root ber/bir/br, meaning 'to take' and going back to the PIE root bher 'bring') and Latin conferre (a prefixed verb with multiple meanings relating to the notion of 'bringing' and going back to the same PIE root as the aforementioned Russian verb).