Where does “საქორთუო” come from?

საქორთუო (Mingrelian) comes from Mingrelian ქორთუ, from Proto-Kartvelian kart-, from Finnish kärsi, from Proto-Finnic karci — char, that has been burned and charred.

Ancestry of “საქორთუო”, step by step

Step	Language	Word	Meaning
1	Mingrelian	ქორთუ	Georgian
2	Proto-Kartvelian	kart-	eastern Georgia, Georgians
3	Finnish	kärsi	Third-person singular indicative past form of...
4	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- →