Agrona

Agrona is a Welsh goddess of war and slaughter.

Though her name bears the root of the modern English word ‘agronomy’, the name for the scientific study of land cultivation, no evidence of her as a harvest/fertility Goddess can be found today. However, she may have been a river Goddess as she is connected to river Aeron in Cardiganshire, which literally means “carnage”.

Agrona is often considered cognate to the Irish Morrigan goddess Macha.

Sources:
http://en.wikipedia.org/wiki/Agrona
http://www.joellessacredgrove.com/Celtic/deitiesa.html
http://www.celtnet.org.uk/gods_a/agrona.html