Declan is an ancient Irish given name anglicized form of an Irish Gaelic saint's name Declán, also Deaglán or Déaglán, or, in colloquial terms, Det, normally all capitalised when written. St. Declan founded a monestary in Ireland in the 5th century, and the St. Declan's stone has been credited as the site of many miracles. The name is believed to mean "man of prayer" or "full of goodness".
Those bearing it include:
Saint Declán of Ardmore (fl. 5th century)Declan Affley (1939–1985), Australian folk singer and musicianDeclan Bree (born 1951), Irish politician and social campaignerDeclan Costello (born 1926), Attorney General of IrelandDeclan Coyne, a fictional character in Degrassi: The Next GenerationDeclan Curry (fl. since 1997), Irish journalist who works for BBC News and BBC Breakfast in the United KingdomDeclan de Barra (born c. 1960), Irish musician, vocalist and bodhrán player of the former band Clann ZúDeclan Donnellan (born 1953), British theatre directorDeclan Donnelly (born 1975), one half of British television duo Ant and DecDeclan Galbraith (born 1991), English singerDeclan Ganley (born 1968), Irish businessman and political activistDeclan Kidney (born 1959), Irish rugby union coachDeclan McCullagh, journalistDeclan McGonagle, Irish art curatorDeclan McKenna (born 1998), British singer, songwriter, and musicianDeclan Patrick Aloysius MacManus (born 1954), the birth name of British musician Elvis CostelloDeclan Meehan (radio presenter), Irish radio presenterDeclan Meehan (Gaelic footballer), Irish Gaelic footballerDeclan Nerney (born c. 1970), Irish country music personalityDeclan O'Rourke (born 1976), Irish Singer/SongwriterDeclan O'Sullivan, Irish Gaelic footballerDeclan Quinn (born 1957), American cinematographerDeclan Ryan (born 1968), Irish sportsmanDeclan Sinnott (born c. 1950), Irish musician