There are so many different variation from the original spelling in Japanese, but I believe the best one is "Konbucha", directly translated from the Japanese word 昆布茶.
It is not to be confused with Kombucha, which is a fermented tea drink.
Definition from Wikipedia: Kombucha is the Western name for sweetened tea or tisane that has been fermented by a macroscopic solid mass of microorganisms called a "kombucha colony," usually consisting principally of Acetobacter-species and yeast cult...
