Where does “kytkye” come from?

kytkye (Finnish) comes from Finnish kytkeä, from Proto-Finnic kütkedäk, from Proto-Uralic kütke- — to bind.

Ancestry of “kytkye”, step by step

Step	Language	Word	Meaning
1	Finnish	kytkeä	to hook, hook up, connect, couple; "~ irti" = to...
2	Proto-Finnic	kütkedäk	—
3	Proto-Uralic	kütke-	to bind

kytkye — Etymology, Origin & Word History | Etymology Explorer