Where does “どいかい” come from?

どいかい (Japanese) comes from Japanese ど, from Japanese と, from Old Japanese と, from Proto-Japonic tə, from Proto-Uralic tä — that.

Ancestry of “どいかい”, step by step

どいかい traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Japanese	ど	super-; 度 degree, extent; 努 the third of the...
2	Japanese	と	with; and; a particle following a phrase or...
3	Old Japanese	と	—
4	Proto-Japonic	tə	place
5	Proto-Uralic	tä	that

Step	Language	Word	Meaning
1	Japanese	厳い	brave
2	Japanese	厳し	the way in which something is tightly packed or...