Family name Деклан (Declan 
, Deklan 
, Деклан 
) , throughout the world, is quite a rare last name. The surname Деклан is characteristic of Ireland, where it is quite a rare surname, Ghana, where it is a rare surname, and Malaysia. Measured by absolute frequency, the name is most common in Nigeria, Ghana, and Malaysia. More frequently, Деклан is the forename as well as the last name.