Shillelagh: a cane made of blackthorn wood, originating in Ireland and still a recognized symbol thereof.
South of Tinahely it turns sharply and flows southwest through Shillelagh, briefly forming the border between County Wicklow and County Wexford, before becoming the border between County Wexford and County Carlow.
The Black Joke was an old tune later known as The Sprig of Shillelagh.