Declan \d(e)-clan, dec-lan\ as a boy's name is pronounced DECK-lan. It is of Irish origin. From Deagl? which is of unknown meaning. The name of an Irish saint (sixth century). The singer Elvis Costello was born Declan Patrick McManus.
Similar baby names are Deccan, Deegan, Dallan, Dalan, Dekwan, Dequan, Deylin, Daylan, Daelan, Delon, Delany, Delano, Delani, Delane, Devlin, Devlyn, Devlon, Devlen, Dillan, Dilan, Dolan, Dylan, Dyllan, Keelan, Kelan, Keilan, Kealan and Kellan.