Olly

Olly is an English diminutive of Oliver, which itself derives from the Old French form of a Germanic name, possibly related to the element alf, meaning elf, combined with hari, meaning army, though it has also long been associated with the Latin word oliva, meaning olive tree. The name gained widespread medieval use partly through the legendary figure of Oliver, one of Charlemagne's paladins in the Song of Roland. Olly functions as an informal pet form used independently in modern English-speaking countries. Related forms include Ollie, Oliver, and the feminine Olivia.