ḥr(“Horus”) + ꜣḫtj(“of the Akhet”). Later, in the New Kingdom, ꜣḫtj was reinterpreted as the dual of ꜣḫt(“Akhet”) instead of a nisba adjective derived from it, rendering a new interpretation of ḥr-ꜣḫtj as a direct genitive construction meaning ‘Horus of the Two Akhets’.
James P[eter] Allen (2010) Middle Egyptian: An Introduction to the Language and Culture of Hieroglyphs, 2nd edition, Cambridge: Cambridge University Press, →ISBN, page 149.
