Family name Diad (Diad 
) , globally, is a rare cognomen. The cognomen Diad is habitual in Lebanon, where it is a rare surname, Egypt, and Portugal. Not in comparison with a country's population, it most frequently occurs in Egypt, Philippines, and Lebanon. Very seldom, Diad is the forename as well as the last name.
Ali, Angel, Ahmed, Bruna, Paulo, Roger, Delia, David, Diana, José, Sueli, Jorge, Julio, Tiago, Elias, Elena, Herni, Yermy, Marcos, Manoel, Monica, Joana, Shady, Saulo, Mauro, Ana, Amr, Bia, Leo, Mari, Maya, Sisa, Baye, Raul, Rosa, Dias, Gina, Luis, Luiz, Jose, Juan, Tony, Noor, Eddy, Imad, Maria, Mikael, and Miguel