Meaning

noun an island to the northwest of Wales

originAnglicized from Irish and Scottish Gaelic Muadhnait, from Middle Irish múad (“noble”). In northern Europe, where the name is much more popular, Mona is interpreted as a diminutive of Monica or, rarely, of Ramona, and sometimes associated with the title of da Vinci's painting Mona (=madonna) Lisa. The Arabic and Persian name مُنىٰ (munā) is sometimes Romanised as Mona.

Etymology from Wiktionary, CC BY-SA 3.0