I was wondering about this the other day, and I figured it would have been the other way around:
The word orange is both a noun and an adjective in the English language. In both cases, it refers primarily to the orange fruit and the colour orange, but has many other derivative meanings.
The word derives from a Dravidian language, and it passed through numerous other languages including Sanskrit and Old French before reaching the English language. The earliest uses of the word in English refer to the fruit, and the colour was later named after the fruit. Before the English-speaking world was exposed to the fruit, the colour was referred to as “yellow-red” (*geoluhread* in Old English) or “red-yellow”.