Deaglan is an Irish surname, though it can also be used as a given name. It is derived from the Irish word "deascai," which means "to speak" or "orator." The name was originally associated with the Deacair family of Ireland, who were known for their eloquence and learning. Today, Deaglan is considered an uncommon but distinctive name choice.
"The name Deaglan experienced significant fluctuations in popularity over the years, with a notable peak in 2012 (43 births) and another in 2015 (50 births). However, it seems to have declined in recent years, reaching a low of 9 births in 2021."