Sinbad is a fictional character so I'm not sure why you think he might have had a real name. It is sometimes spelt "Sindbad", and another variant on it is Smbat, which is used in Armenia. None of these could be said to be his real name though.
Susie
In the novel"The Count of Monte Cristo",written by Alexander Dumas,the hero,Edmund Dantes,assumed various aliases.
One of these was Sinbad the Sailor.
The answer could be Edmund Dantes. May be a bit of a long shot.
TJ
sorry i havent disappeared off the face of the earth , cant always get to the computer, thanks for the answer i dont know if its right but it is a good sugestion, and in the absence of any other answer it will be fine thanks again