The name Mallorca is Spanish in a Catalan dialect. Catalan is the primary language on the island. More precisely, its derivative is called Mallorca. In Spanish, the double letter ll in most words reads like a short i. You don't pull it out but pronounce it quickly as if it were almost non-existent. To be clear, Mallorca can be pronounced as "Ma-your-ka."
This spelling is unusual for native Spaniards and Mallorcans. But for English speakers, the double ll in Mallorca is still two letters ll. This spelling needs to be clarified to most people. The "ll" was replaced by a "J" in the 1970s. That made life easier for the tourists.
The name 'Majorca" is grammatically correct. So in English pronunciation, Majorca is the same as Mallorca. Foreigners use the name Majorca along with Mallorca. And it never confuses anyone. Similarly, many Spanish-speaking countries in South America have replaced the 'll' with the 'J' in their dialects.
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