by 1827 as the name of Leonardo's painting or its subject, Lisa, wife of Francesco del Giocondo (see Gioconda). Mona is said to be a contraction of madonna as a polite form of address to a woman, so, "Madam Lisa." The name is by 1923 (D.H. Lawrence) in reference to her enigmatic smile or expression.[Mona Lisa etymology, Mona Lisa origin, 英语词源]