Man of prayer or full of goodness
Declin is a rare variant of the Irish name Declan. It is most famously associated with Saint Declan of Ardmore, who was one of the early Christian missionaries to Ireland preceding Saint Patrick.
Less common today
Declin isn't in the latest US Top 1000. It last peaked at #6,282 in 2014.
Early Irish saint and missionary
US births per 5-year period, 1990βpresent (SSA data).