Where does “Қарҭ” come from?

Қарҭ (Abkhaz) comes from Mingrelian ქართი, from Old Georgian ქართლი, from Proto-Kartvelian kart-, from Finnish kärsi, from Proto-Finnic karci — char, that has been burned and charred.

Ancestry of “Қарҭ”, step by step

Step	Language	Word	Meaning
1	Mingrelian	ქართი	—
2	Old Georgian	ქართლი	Kartli
3	Proto-Kartvelian	kart-	eastern Georgia, Georgians
4	Finnish	kärsi	Third-person singular indicative past form of...
5	Proto-Finnic	karci	char, that has been burned and charred

Every word from Proto-Finnic karci →Every word from Finnish kärsi →Every word from Proto-Kartvelian kart- →