The cuneiform ka sign is a common, multi-use sign, a syllabic for ka, and an alphabetic sign used for k, or a; it is common in both the Epic of Gilgamesh over hundreds of years, and the 1350 BC Amarna
Amarna letter EA 364-(Obverse), Ayyab to Pharaoh, "Justified War"; line 3 (2nd sign for ka): "Servant-yours, at...", "ARAD-ka, a-na...." (Note: the 2 horizontals at the right side of "ka", are barely visible, compared to the 2 well-scribed verticals) (high resolution expandable photo)