Namesakes
Ciarán the Elder
(a.k.a. Kieran) (m) ?-530 
Saints
Ciarán the Younger
(a.k.a. Kieran) (m) ?-556
Saints
Ciarán the Devout
(a.k.a. Kieran) (m) ?-870
Saints
Kieran Crowley
(m) 1961-
Notable Athletes (rugby)
Kieran Modra
(m) 1972-2019
Notable Athletes (cycling)
Kieran O'Brien
(m) 1973-
Notable Actors and Entertainers (actor)
Kieran Culkin
(m) 1982-
Emmy Award Winners 2023 Succession (actor)
Notable Actors and Entertainers (actor)
Oscar Award Winners 2025 A Real Pain (actor)
Kieran Read
(m) 1985-
Notable Athletes (rugby)
Kieran Govers
(m) 1988-
Olympic Medalists 2012 field hockey (bronze)