Memes

Nope, earlier, it's Göttingen school of history stuff. Essentially the bible-based alternative to Blumenbach:

II) During the time of Moses, the Semites lived partly in India, towards the Ganges, partly on the coasts of the South Sea to the Persian Gulf, in Elymais, Assyria, Chaldea, and in southern Mesopotamia, and with further expansion in some areas of Palestine, in the north and south of Arabia, finally too, but maybe not yet in Moses's time, in Abyssinia or Ethiopia.

Which isn't totally off compared to our modern understanding of who spoke proto-Semitic. "Semitic" as a descriptor of languages is unchallenged in linguistics because, well, symbols are arbitrary anyway and "Descendants of Shem", as in Noah's son, ancestor of Abraham, is not exactly a contentious thing among a group of related cultures having birthed no less than three Abrahamic religions.