Ariff Ariff

For the last 14 months , my son's name on the receipt was printed as MUHAMMAD HAIKAL ARIFF. I have no argument coz its fine to me. Last week when I was about to pay monthly fee as usual, the teacher asked me his full name for the record. So again I mentioned MUHAMMAD HAIKAL ARIFF BIN ARIFF. The teacher look into my face and I nodded and repeated the same thing with full spelling. She seem confused. So I informed her that he has a sirname!