Irkalla was originally another name for Ereshkigal, who ruled the underworld alone until Nergal was sent to the underworld and seduced Ereshkigal (in Babylonian mythology).
Namtar (or Namtaru, or Namtara; meaning destiny or fate), was a hellish minor deity in Mesopotamian mythology, god of death, and minister and messenger of An, Ereshkigal, and Nergal.
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Namtar was the son of Enlil anid Ereshkigal; he was born before his father raped the goddess Ninlil.