Ériu, the patron goddess of Ireland. When humans first arrived in Ireland, three important sister goddesses all asked that the island be named after them. Ériu was given the honor, and therefore the ancient name of Ireland is Éire.
Green Goddess - Art Nouveau Emerald Gaia Print by Emily Balivet, A portrait of Gaia, the primordial deity in the Ancient Greek pantheon and considered a Great Goddess, her name literally means "Earth Mother".
Brigid In Irish mythology (a subset of Gaelic myth, within Celtic myth) Brigid was the daughter of the Dagda, who existed as a father figure and protector of the Tuatha Dé Danann, a group of people said to have been the fifth to settle Ireland.
Danu is the Mother Goddess of the Tuatha de Danann and one of the most well known of the Irish . She is said to have given birth to many other Irish Gods and Goddesses and is therefore the high Mother Goddess over the others.