Nitaino (Taino): The Tainos are the pre-Columbian indigenous inhabitants of the Bahamas and the Antilles, and presumably the Prospero Keys as well. Taino society is divided into the Nitainos (nobles) and Naborias (commoners).
Iris (Greek): In Grecian mythology, Iris is the goddess of the rainbow. English, which borrows from the same source, gives multiple definitions of Iris as a purple flower, and part of the human eye.
Alonso (Spanish): Derivative of Alfonso, which is a germanic name probabily meaning "noble" (Alal) and "ready" (Funs). Alternatively, the first element could be "battle" (Hadu or Hild). (Source: http://www.behindthename.com/name/alfonso)
Charlie: I can't believe you said yes. Rain: Why wouldn't I say yes? Charlie: After the way you interrogated her? Rain: Waterskiing, Charlie. It was a good offer. Besides, if we weren't a little shallow, we wouldn't be teenagers.
Rain: I’m never going to do anything. I’ll never go anywhere. I’ll graduate high school and spend the rest of my life ushering tourists around these same eight islands! Sebastian: Now I don’t believe that, Raindrop. I don’t believe that for a second. This is home. And frankly, it’s not a bad place to make a life. So you may come back someday to usher tourists. After all, I did. But you’ll get your own chance to decide. You've always been special, Rain. An adventurer. We’d turn our backs for a minute, and you’d be off exploring. Before you could walk, even. And I remember watching you as you grew up. You’d have long conversations with your imaginary friends. You’d fight pirates. Find treasure. Solve mysteries. I knew you were destined for greatness