The name Aiden is a girl's name of Irish origin meaning "little and fiery".

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Aiden/Aidan is just beginning to wander into the girls' side of the name popularity list, but it's so huge for boys in all its spellings that it will be a long time before it can be called a unisex name.

Nearly 8000 baby boys were given the Aiden spelling alone in the US last year, and only 43 baby girls -- less than one percent of the total.

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Aidan

The name Aiden is a boy's name of Irish origin meaning "little and fiery".

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Aiden in all its spelling variations is the Anglicized version of the Irish Aodhán, which 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 century Irish saint, noted for his kindness and generosity and for spreading Christianity.
 
Aiden has been a spectacular name success story—especially if you add all its various spellings together. Counted together, Aiden in all its versions is still a Top 10 boys' name.
 
The Aiden spelling has become the predominant version of the name in the US, followed by Ayden -- and then, in order of popularity, Aidan, Adan, Aden, Aydin, Aydan, Eiden, Aidyn, Eydan, Eyden, Adin, Aedan, and Aiyden. And then there's a pack of popular rhyming offshoots such as Brayden and Kaden.
 
Irish actor Aidan Quinn introduced the name to the US. The Aiden spelling was used by actress Tracey Gold and Rod Stewart for their sons.

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