Aiden has been a spectacular name success story--especially if all its various spellings were to be added together. Aiden cracked the Top 10 in 2010 and remained there until 2013, when it dropped to Number 12. The Aiden spelling has far outperformed the traditional Irish Aidan and has now become the accepted version, after spawning a pack of popular rhyming offshoots such as Brayden and Kaden.
Aidan was originally a pet form of the Irish name Aodh (pronounced 'ee'), who was the old Celtic god of the sun and fire. St. Aidan was a famous seventh cenury Irish saint, noted for his kindness and generosity and for spreading Christianity. Americans first noticed it via actor Aidan Quinn; the Aiden spelling was used by actress Tracey Gold and Rod Stewart for their sons.