Where does “ḫꜥ” come from?

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

Ancestry of “ḫꜥ”, step by step

Step	Language	Word	Meaning
1	Egyptian	ḫꜥ	—
2	Egyptian	ḫꜥj	to appear; to rise; to shine forth