I think most people (if this thread is anything to go by!) immediately think cruise ships.
It will also be misheard as Arianna anyway. Or Rihanna. (I wouldn't use Arianna (at least in the UK) for the same reason. Unless you have Italian etc background, people will I think just think Rihanna. I used to love Rihannon though, when I had a girlcrush on Stevie Nicks.