Mor may derive from an Indo-European root connoting terror, monstrousness cognate with the Old English maere (which survives in the modern English word 'nightmare') and the Scandinavian mara and the Old East Slavic 'mara' ('nightmare') while rígan translates as 'queen'. There is some disagreement over the meaning of the Morrígan's name. She is associated with the banshee of later folklore. The Morrígan is described as the envious wife of The Dagda and a shape-shifting goddess, while Badb and Nemain are said to be the wives of Neit. In modern sources Nemain may also be named as one of the three Morrigan along with Badb, Macha, although her inclusion is unclear The three Morrígna are also named as sisters of the three land goddesses Ériu, Banba, and Fódla. It is believed that these were all names for the same goddess.

In mythology membership of the triad is given as Badb, Macha, and the Morrigan, who may be named Anand. The Morrígan is often described as a trio of individuals, all sisters, called 'the three Morrígna'. She is most frequently seen as a goddess of battle and war and has also been seen as a manifestation of the earth- and sovereignty-goddess, chiefly representing the goddess's role as guardian of the territory and its people.

The Morrígan encourages warriors to do brave deeds, strikes fear into their enemies, and is portrayed washing the bloodstained clothes of those fated to die. She incites warriors to battle and can help bring about victory over their enemies. In this role she often appears as a crow, the badb. The Morrígan is mainly associated with war and fate, especially with foretelling doom, death, or victory in battle.

The name is Mór-Ríoghain in Modern Irish, and it has been translated as 'great queen' or 'phantom queen'. The Morrígan or Mórrígan, also known as Morrígu, is a figure from Irish mythology. For other uses, see Morrigan (disambiguation).

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