Same
Middle English: from Old Norse sami, from an Indo-European root shared by Sanskrit sama, Greek homos .
wiktionary
From Middle English same, from Old Norse samr(“same”) and/or Old English same, sama(“same”) in the phrase swā same (swā)(“in like manner, in the same way (as)”), both from Proto-Germanic *samaz(“same”), from Proto-Indo-European *somHós(“same”). Cognate with Scots samin(“same, like, together”), Dutch samen(“together”), Danish samme(“same”), Swedish samma(“same”), Norwegian Bokmål samme(“same”), Norwegian Nynorsk same(“same”), Gothic 𐍃𐌰𐌼𐌰( sama), a weak adjectival form, Ancient Greek ὁμός(homós, “same”), Old Irish som, Russian са́мый(sámyj), Sanskrit सम(samá), Persian هم (ham, “also, same”).
From Middle English same, samme, samen, (also ysame, isame), from Old English samen(“together”), from Proto-Germanic *samanai(“together”), from Proto-Indo-European *sem-(“one, together”). Cognate with Scots samin(“together”), Dutch samen(“together”), German zusammen(“together”), Swedish samman(“together”), Icelandic saman(“together”).
etymonline
same (adj.)
perhaps abstracted from Old English swa same "the same as," but more likely from Old Norse same, samr "same," both from Proto-Germanic *samaz "same" (source also of Old Saxon, Old High German, Gothic sama, Old High German samant, German samt "together, with," Gothic samana "together," Dutch zamelen "to collect," German zusammen "together"), from PIE *samos "same," from suffixed form of root *sem- (1) "one; as one, together with."
Old English had lost the pure form of the word; the modern word replaced synonymous ilk. As a pronoun from c. 1300. Colloquial phrase same here as an exclamation of agreement is from 1895. Same difference curious way to say "equal," is attested from 1945.
