Berylla Boffin
From Tolkien Gateway
Berylla Baggins (born Third Age 2772), born Berylla Boffin, was the wife of Balbo Baggins and mother of Mungo Baggins, Bolger, Ponto Baggins, Largo Baggins, and Lilly Goodbody. Her years of birth and death are not given in The Lord of the Rings, but a birth-year of 2772 for her appears on Boffin family tree BF4 in The Peoples of Middle-earth.