The name Declen is a male given name that is pronounced as DEK-lin (/ˈdɛklɪn/). It is considered a variation of the more commonly known name Declan. The name has Irish origins and is often associated with Saint Declan, an early Irish saint who played a significant role in bringing Christianity to Ireland before the arrival of Saint Patrick. Despite its historical roots, the name Declen remains relatively rare in the United States. According to data, it has seen fluctuating popularity over the years, with occurrences ranging from 5 to 11 newborns annually between 2011 and 2022. Its highest rank was 7065 in 2015, indicating its unique yet underutilized status among baby names in America.