Agir derives from the PIE root words of *paewr- or *egni; which is Adar, Agiari, Azar, Azer, Atâr, Adur or Atarš in Avestan and Agni in Sanskrit.
*paewr refers to fire as substance
*egni refers it as living force
Old Saxon fiur,
Adar: March (Newroz or Nowruz is celebrated on 21st of March), a Zoroastrian festival and new year.
Agirî: Kurdish city of Agri (Turkey) and Mount Ararat (a volcanic cone = fiery mountain).
As in names of God in Zoroastrianism (Avestan): Adar-bad-gar (Who Changes Fire Into Air), Aadar-Nam-Gar (Who Changes Fire Into Water), Adar-kibritatum (Who Changes Fire Into Jewels)
Atâr, atarš (Av.) Adar, Âdur (Phl.); Fire, the consecrated fire, the son of Ahura Mazda, the yazata of fire.
As in "Azerbaijan": Azer (fire), baygan (protector) deriving from PIE names of Atropatene, Āturpātākān, Ādharbādhagān, Ādhorbāygān and Āzarbāydjān.