Morrigan comes from Irish mythology: the Morrígan is a goddess of war and fate who appears as a crow, and her name is usually explained as "great queen" or "phantom queen", from Old Irish mór, great, or mor, phantom, and rígain, queen. The name has become a bold choice in the recent wave of mythological girls' names. In the United States Morrigan is rare, peaking at number 2577 in 2023 and ranking number 2742 in 2025.