Where does “ϣⲁⲓ” come from?

ϣⲁⲓ (Coptic) comes from Demotic ḫꜥ, from Egyptian ḫꜥ, from Egyptian ḫꜥj — to appear; to rise; to shine forth.

ϣⲁⲓ (Coptic): to shine; šai; the name for the letter Ϣ, ϣ in...