“The hypothesis [of Yahweh's Midianite-Kenite origin] is constructed on four bases:

[1] the narratives dealing with Moses' family and his Midianite in-laws;

[2] poetic texts which are understood to refer to the original residence of Yahweh;

[3] Egyptian topographical texts from the fourteenth to the twelfth century BCE dealing with the Edomite region in which the name Yahweh appears;

[4] and an interpretation of Cain as the eponymous ancestor of the Kenites and the mark of Cain as signifying affiliation to the Yahwistic cult community.

(p. 133)

(from 'The Midianite-Kenite Hypothesis Revisited and the Origins of Judah', JSOT 33.2 (2008): 131-153)”