It sounds more like the kind of name you would expect from someone who wanted to create a name that sounded Japanese. My guess is that the Bahamian officials give him that name.
The entire story reeks of something fishy. I mean if his English language skills were so rotten why was he travelling by himself? He claims to have had a fairly substancial chuck of money and yet no one seems to have cared enough to inquire about him? Where was the guy staying? If a hotel, than this shouldn't have been a problem. Where did he leave his bags so that they were stolen? If he had not checked into a hotel why did he go to a casino?