Tea originates from China. It was from there, Persian travelers took it with them. They called it Chaí, which is Farsi for "green juice". Arabian merchants too it to the Arabic world, and in the 1500s and 1600s, the Dutch took it with them, calling it "thee'', from which the word "tea" comes
As to why the Dutch should call it 'thee', they picked it up from the Amoy Chinese word ''t'e''.The Mandarin word for tea is ''chai'', which the Persians and many others used.