There are 4 names matching your criteria.
AGRONA f Celtic Mythology
Derived from the old Celtic element agro
meaning "battle, slaughter". This was the name of the Brythonic goddess of war and death.
ANDRASTE f Celtic Mythology
Possibly means "invincible" in Celtic. This was the name of a Briton goddess of victory who was invoked by Boudicca
before her revolt.
EPONA f Celtic Mythology
Derived from Gaulish epos
meaning "horse". This was the name of the Celtic goddess of horses.