In the world, Hài (Hài 
) is a rare mostly boy's, but infrequently girly forename. The first name Hài is habitual in Northern Africa, particularly Tunisia, where it is a rare epicene name, Algeria, where it is a rare male name, and Morocco, where it is a very rare masculine name. Not in comparison with a country's population, it is the most numerous in Tunisia, Algeria, and Vietnam. Likewise, Hài is the last name as well as the forename.