According to Dr S.K. Kellett-Smith, the name "Crevichon" means "island of crabs, crayfish or cranes".
Like many names in the Channel Islands, it is Norman language in origin. A thousand years ago, the water level was ten feet lower (3 m), so there were many more of the animals the island was named after.
A 16th-century drawing of the islet, now in the British Museum, shows Crevichon as apparently a wooded islet.
Prof. John Le Patourel, in The Building of Castle Cornet said that in 1566, iron and hammers were taken to "Creavissham", and the island quarried for the castle. The quarry has been used since then, but this has made the island much smaller, and less visible. As a result, a fifteen-foot (4.6 m) marker was built on the top. Crevichon may have provided the granite for the steps of St. Paul's Cathedral in London.
It is said that in earlier times, pirates were hanged on it with chains, like nearby Jethou.
In 1953, Victor Coysh says that he saw the remains of a German bomber, from the time of the occupation.
Other wrecks include:
- Courier, a Guernsey steamer, beached in 1905 with 80 passengers.
- Channel Islets - Victor Coysh
- Alan, Wiseman; Flowers, Min (2007-08-18). "Quite Interesting". The Daily Telegraph. London: Telegraph Media Group Limited. Retrieved 2008-04-12.
An even smaller Channel Island, Crevichon, to the north of Jethou, is said to have provided the granite for the steps of St Paul's Cathedral.
- "Chance for people to visit Jethou". BBC News Online. BBC. 2004-06-19. Archived from the original on 2004-07-12. Retrieved 2008-04-12.
'The steps to St Paul's Cathedral are said to be made with granite from Crevichon, the little island to the north of Jethou.'
- Pictures of Crevichon by the Faeds of Jethou
- Faed Family WebSite with pictures of Jethou and Crevichon