From the Irish place name Caiseal, meaning "stone fort" or "castle."
Cashel is an Irish place name turned given name, derived from the Old Irish caiseal, meaning 'stone fort' or 'circular stone fortification' — itself borrowed from the Latin castellum. The name's most storied bearer is the Rock of Cashel in County Tipperary, a dramatic limestone outcrop crowned with medieval ecclesiastical ruins including a Romanesque chapel, a Gothic cathedral, and a 12th-century round tower. For centuries, Cashel was the seat of the Kings of Munster and one of Ireland's most significant political and spiritual centers.
St. Patrick reportedly baptized Óengus, King of Munster, at Cashel around 450 AD. As a given name, Cashel has been used in Ireland for generations, carrying the geographic pride that Irish families often invest in place names — not unlike how Connacht, Kerry, or Clare function as given names.
Outside Ireland, its profile rose considerably when rock musician Bob Geldof named his son Cashel Blake Geldof in 1989, planting the name in the consciousness of an international audience and giving it a counter-cultural, artistic edge. In the 21st century, Cashel has found steady appreciation among parents seeking Irish heritage names that feel strong and grounded without being overused. It occupies a distinctive niche: more rugged than Cillian, more place-rooted than Cormac, carrying the literal weight of stone walls and ancient kingship. Its '-el' ending gives it a slight softness that balances its fortress etymology perfectly.