Where does “кыз” come from?

кыз (Udmurt) comes from Uzbek kuz, from Swedish kise, from Proto-West Germanic kāsī, from Proto-Germanic kāsijaz, from Latin cāseus, from Proto-Indo-European kwat- — to ferment, become sour; to boil.

кыз (Udmurt): fir

Definitions

Ancestry of “кыз”, step by step

Step	Language	Word	Meaning
1	Uzbek	kuz	autumn, fall
2	Swedish	kise	—
3	Proto-West Germanic	kāsī	cheese
4	Proto-Germanic	kāsijaz	cheese
5	Latin	cāseus	cheese
6	Proto-Indo-European	kwat-	to ferment, become sour; to boil

Every word from Proto-Indo-European kwat- →Every word from Latin cāseus →Every word from Proto-Germanic kāsijaz →