Where does “kꜣpt” come from?

kꜣpt (Egyptian) comes from Egyptian -t, from Proto-Afro-Asiatic -t.

Ancestry of “kꜣpt”, step by step

Step	Language	Word	Meaning
1	Egyptian	-t	Used to form feminine singular forms of nouns; An...
2	Proto-Afro-Asiatic	-t	—