Iban or Ibán?

OK, I know this is really embarassing, but how do you spell Iban`s name? Is it a straigth forward Iban, or is it Ibán? You see the difference? Some say Iban, some say Ibán. Though, a vast majority spell it as I do; Iban. I guess is`s only a minor difference, and not important whatsoever, but I would like to get it rigth. As you know, I`m Norwegian, and I don`t speak Spanish at all, so I was hoping for some help from you guys. If anyone of you have any idea, would you please leave a comment? I would really appreciate it.