Declan is an Irish given name, derived from the Old Irish 'Dommhall,' which means 'full of goodness.' It was borne by several early saints and has since become a popular choice for parents in Ireland and beyond.
"The name Declan saw a steady increase in popularity from 6 births in 2001 to 40 births in 2021, with the highest number of births recorded in 2021 and 2023 at 40 each. The total number of births between 2001 and 2023 is 371."