Conan Osiris (real name Tiago Emanuel da Silva Miranda) is a Portuguese singer who represented his country in Eurovision 2019 with the song "Telemoveis". It sadly didn't qualify, despite being my winner that year.
This name seems to have been used by other Celts at one time, not just Irish. A Breton from Rennes, Conan I (927-992), was Duke of Brittany from 990 to his death.
The main character in the anime Case Closed, or Detective Conan in Japan, calls himself Conan Edogawa when he becomes a child again thanks to a drug slipped to him by a criminal organization.