The Morrígan is a goddess of battle, strife, and sovereignty. She is one of the triple Goddesses, her different aspects are represented by Anu (the fertility maiden), Badb (the boiling mother cauldron) and either Macha (the death crone) or Nemain.
There is some disagreement over the true meaning of the Morrígan's name as to whether it means Phantom or Monster. Mor is generally agreed by current day scholars to be the Indo-European root cognate for something bad or evil usually death and is the word that evolved into other words such as Mortal , Mortality , Mortuary , Monsters etc , etc. Connoting terror or monstrousness, cognate with the Old English maere (which survives in the modern English word "nightmare") and the Scandinavian mara and the Old Russian "mara" ("nightmare"); while rígan translates as 'queen'. such as the English word reign. This can be reconstructed in Proto-Celtic as *Moro-rīganī-s. Accordingly, Morrígan is often translated as "Phantom Queen" and "Monster Queen". These two meanings are the derivations generally favored in current scholarship.