Gillen is an uncommon yet distinctive given name, of Irish origin, meaning ' Servant of St. Finian'. It is often associated with the Irish saint Finnian of Clonard, who was a teacher and founder of one of Ireland's most famous monasteries in the 6th century. The name Gillen is believed to have been brought to Scotland by Irish immigrants, where it has since become more prevalent.
"In 1990, there were five individuals named Gillen born."