Ceridwen \ce-rid-wen, cer(i)-dwen\ as a girl's name is pronounced ke-RID-wen. It is of Welsh origin, and the meaning of Ceridwen is "fair, blessed poetry". From "cerdd gwen". Celtic mythology: name of the goddess of poetic inspiration. Also supposedly the name of the mother of the legendary sixth-century Welsh hero Taliesin.
For more information, see also the related name Carey.