The term cha (茶) is Sinitic, meaning it is common to many varieties of Chinese. It began in China and made its way through central Asia, eventually becoming chay (چای) in Persian. That is no doubt due to the trade routes of the Silk Road, along which, according to a recent discovery, tea was traded over 2,000 years ago. This form spread beyond Persia, becoming chay in Urdu, shay in Arabic, and chay in Russian, among others. It even made its way to sub-Saharan Africa, where it became chai in Swahili. The Japanese and Korean terms for tea are also based on the Chinese cha, though those languages likely adopted the word even before its westward spread into Persian.
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