Lewis Fleming from Ballymoney died after the incident at the Powerscourt Waterfall on Wednesday afternoon.
Gardaí said the teenager was pronounced dead at the scene.
Investigations are ongoing into the incident, which is being treated as a tragic accident.
Lewis was a pupil at Coleraine Grammar School and a member of Ballymoney Swimming Club.
School principal David Carruthers paid tribute.
“The whole school community is devastated to hear of the tragic death of Lewis Fleming on holiday in Co Wicklow, which Gardai are treating as an accident,” he said.
“Lewis was a lovely young man, about to enter Year 12, who contributed hugely to school life in the classroom, on the rugby field, the athletics track and in the swimming pool.
“Lewis had a wide circle of friends, a great sense of fun and will be sorely missed by everyone.
“I personally found Lewis to be an engaging, pleasant pupil who was always happy to have a chat.
“This is a real tragedy and a terrible loss for Lewis’s whole family and for our school community. Our thoughts and prayers are with Lewis’s family at this tragic time.”
