Napoleon was christened 'Napoleone' but in Corsica it was pronounced, or sounded, 'Nabullione'. His name came from ancient Egypt from a martyr who was killed under Diocletian. He was named after one of his mother's uncles who had fought against the French occupation of Corsica and had recently died. He was given no middle name.
Napoleon himself later shortened his given name to the French spelling, Napoleon' about 1779 when he went to France to school. He also changed the spelling of his last name from Buonoparte to Bonaparte.
Later, the Grande Armee had both odd and interesting nicknames for their chief. Because of his short haircut 'a la Titus' which he affected as First Consul and Emperor, the troops referred to him as 'Le Tondu'-'the Shorn One.'
He was also called 'Father Violet' and 'John of the Sword' by the Grande Armee.