The official name of the island is in Catalan “Eivissa”. Its name in Spanish is Ibiza. In British English, the name is usually pronounced in an approximation of the Spanish whereas in American English the pronunciation is more anglicized, or closer to Latin American Spanish.
The origin of the island’s name is in the Phoenician language Ibosim. The Greeks called it Ebysos, the Romans Ebusus and the Moorish Yebisah.
In the 18th and 19th centuries the island was known to the British, and especially the Royal Navy, as “Ivica”