Sumerians
 

Black-headed looks a lot more like a mention of the hair-color than skin-color. Therefore the existence of this obvious difference is odd because their Semitic alternatives had mainly black hair as well, It's odd, nevertheless. No body knows without a doubt where they originated however the predominant idea (and that recognized by historic Sumerian statements) was that they originated from Bahrain. Them having a unique language isn't that unique in the situation of historical languages; the Hurrian language, for instance, was neither Semitic nor Indo-European and doesn't have enduring relations. The Kassite and Elamite languages, as well.