Where does “kombucha” come from?

kombucha (Portuguese) comes from English kombucha, from Japanese 昆布茶, from Japanese 茶, from Japanese 葉, from Middle Chinese 葉.

kombucha (Portuguese): kombucha

Definitions

Step	Language	Word	Meaning
1	English	kombucha	A fermentation of sweetened tea of Mongolian...
2	Japanese	昆布茶	a drink made by chopping kombu, usually into powder, adding it in hot water, and drunk like tea
3	Japanese	茶	tea; brown
4	Japanese	葉	leaf, needle, blade; a season, an age: a shorter...
5	Middle Chinese	葉	—