[sayrer]

If you look at the history there, you'll see "naranj" in the Arabic. This is still the word in Spanish: Naranja (البرتقالي).

The wikipedia article is pretty good: https://en.wikipedia.org/wiki/Orange_(fruit)

That article says sweet oranges originated from China or Myanmar, and made their way west. Introduced to the Iberian Peninsula by the people then called the "Moors".