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Random ideas (most of these probably won't work for your setting, but I'm just brain-vomiting various Aiden-like words:)

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Aedin
Aedan
Aeden
Aerin
Erin
Eryn
Eirian
Aidanne
Aidenne
Aeryn
Aedyn
Aidyn
Ayden
Aodhan
Aodhana
Aidana
Aidena
Aedina
Aedana
Aedenna
Aelin
Aylin
Ailen
Ailyn
Ailin
Ailinn
Eileen
Edana (feminine form of Edan which is a variant of Aidan)
Keegan or Kegan (sort of boyish but comes from the same root as Aiden. And I know 2 female Kegans.)
Azar, Nina, Ignatia, and Pyrrha have "fire" meanings but have nothing to do with Aiden.
Fiera means "proud" but definitely reminds me of "fire"/"fiery"
Brynn, Brynna, Brynni, Bryni (Bryni = old english name meaning "fire" (according to definition of Brenton)
Kenna, Kenina, Cina? (Cinaed means born of fire and that's what Kenneth comes from)