Saint Brigid of Ireland is one of many Irish Saints who have been associated with ancient Celtic Pagan Gods and Goddesses. The Celtic Goddess Brigit (or Brigid, Bríg), whose name means 'exhalted one', was of the Tuatha Dé Danann, the daughter of the Daghda and wife to Eochu Bres. She is associated with the Spring season, with fertility, healing, poetry and smithcraft. SHe is credited with creating the ancient tradition of 'Keening', which is a form of wailing, weeping and singing, and is caried on to this day in rural Ireland, especially at wakes and funerals.
The Goddess Brigid was 'syncretized' with Saint Brigid during the middle ages. This was a process whereby the practices, beliefs and traditions of a Christian Saint were merged, blended and assimilated with an earlier often mythological character. It is no coincidence that both Brigid the actual Saint who lived in Kildare and Brigit the mythological Goddess of old Ireland are both associated with the coming of Spring.