The story
- Latin · derived fromRegnum Utriusque Siciliae
- Italian · derived fromRegno delle Due Sicilie
- English todayKingdom of the Two Sicilies
A calque of Italian Regno delle Due Sicilie and Latin Regnum Utriusque Siciliae, both named in reference to the 1816 creation of the state as the personal union of the Kingdom of Sicily before Faro (the Kingdom of Naples, by its formal name), and the Kingdom of Sicily beyond Faro (the Kingdom of Sicily proper).
Etymology from Wiktionary, CC BY-SA 4.0.