Could be that Ahmed is just his father's name as Arabs tend to give their kids the middle names of the fathers before them. It can sometimes create very, very, very, VERY long names if the chain isn't broken. Have heard of cases where the man had like 50 middle names. It is kind of crazy.

Of course, that doesn't explain why he would decide to not have his last name on the certificate if it really is his, but this could be an explanation for the name.