Family name Àb (Àb 
) , around the world, is quite a rare last name. The cognomen Àb is characteristic of Northern Africa, particularly Morocco, where it is quite a rare surname, Libya, and Tunisia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Northern Africa, particularly Morocco, Algeria, and Egypt. More frequently, Àb is the forename as well as the last name.