"Hasnain" is a name which is generally uncommon. People with this name tend to be extremely handsome and get tons of action. Actually, tons is an understatement.
You can pretty much tell a "hasnain" from the rest of the crowd. He is the person that makes your head turn.
Hasnains are also very intelligent. They are good people to sit next to during exams.
U'll know when you experience a "hasnain".