In Marvel's Guardians of the Galaxy, Ronan the Accuser was a Kree radical. He was part of the Kree military, and he refused to accept the peace treaty between his world and Xandar. He agreed to obtain an orb for Thanos in return for the destruction of Xandar. When he discovered that the orb contained an infinity stone, Ronan broke his deal with Thanos and attempted to destroy Xandar using the stone. He was defeated by the Guardians of the Galaxy.
In Stargate: Atlantis, Ronon Dex was born on the planet Sateda in the Pegasus Galaxy. He was implanted with a tracker and hunted by the wraith for sport. Sheppard's team helped him remove the tracker, and he joined them when he learned that his people had been wiped out by the wraith.
In Harry Potter, Ronan was a centaur that lived in the forbidden forest. He led the centaurs during the Battle of Hogwarts during the Second Wizarding War.
Ronan is a Gaelic name that means "little seal". Ronan entered the top 1,000 names in the U.S. for boys in 2001 and has been steadily climbing ever since. In 2014, it was the 366th most popular name for boys. The name was also given to 9 girls.The alternate spelling Ronon was given to 10 boys.