Aidan is an ancient Irish saint's name with a fire meaning that's mega popular for boys, most often spelled as Aiden. The name is occasionally used for girls, sometimes as Aidyn or Ayden, as well. Aidan was the name of a famous seventh-century Irish saint, and is related to the Irish word for fire.

Aidan was originally a pet form of the Irish name Aodh (pronounced 'ee'), the name of the old Celtic god of the sun and fire. The name was borne by numerous early Irish saints, one of whom was noted for his kindness and generosity.