Monday tarddiad. Anglicized form of Mac giolla eoin. The last part of the surname was mistakenly taken as the Gaelic word for "Monday", Luain. Cael Monday tarddiad.
Enwau cyfystyr ar gyfer Ninon mewn gwahanol wledydd ac ieithoedd: Aina, Ana, Anabel, Anabela, Anaïs, Anca, Ane, Ane, Aneta, Anett, Ani, Ania, Anica, Anika, Anikó, Anina, Anissa, Anita, Anka, Anke, Ann, Anna, Annabella, Annag, Anne, Anneka, Anneke, Anneli, Annelien, Annet, Annett, Annetta, Annette, Anni, Annick, Annie, Anniina, Annika, Anniken, Annikki, Annukka, Annushka, Annuska, Anouk, Ans, Antje, Anu, Anya, Chanah, Channah, Hana, Hania, Hanna, Hannah, Hanne, Hannele, Hena, Henda, Hene, Henye, Jana, Keanna, Nainsí, Nan, Nancy, Nandag, Nanette, Nannie, Nanny, Nensi, Nettie, Niina, Nita, Ona, Panna, Panni, Quanna. Cael Ninon mewn ieithoedd eraill.
Mae'r rhan fwyaf o'r enwau cyffredin gyda cyfenw Monday: Anne, Aldo, Krishnaprasanna, Lynwood, Shandra. Cael Enwau sy'n mynd gyda Monday.