The crossword solution for the term 'Jolly Old Saint' is NICK. NICK is a common nickname for the name Nicholas, which is derived from the Greek name Nikolaos, meaning 'victory of the people'. The name is most famously associated with Saint Nicholas, a 4th-century Christian saint and Bishop of Myra, who was known for his generous gifts to the poor. He is the patron saint of children, sailors, and merchants, and is often referred to as 'Jolly Old Saint NICK' in popular culture.