Last name Yennan (Yennan 
) , in the world, is a very rare family name. The family name Yennan is habitual in Australia, where it is a very rare surname, Nigeria, where it is an extremely rare surname, and Venezuela. Not in comparison with a country's population, the name is most common in Nigeria, Australia, and India. More prevalently, Yennan is the forename as well as the last name.