Aiden

By the way, in English-speaking countries, the spelling of Aiden is more popular than the spelling of Aidan. So the description should say this: "Variant of Aidan. This is currently the more popular spelling of this name."

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In the USA it overtook the popularity of Aidan in 2006 and peaked over Aidan in 2009 according to the USA Social Security Administration.
https://www.behindthename.com/name/aiden/top/united-states?compare=aidan

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https://www.behindthename.com/name/aiden/top/australia-nsw?compare=aidan
https://www.behindthename.com/name/aiden/top/new-zealand?compare=aidan
https://www.behindthename.com/name/aiden/top/canada?compare=aidan
https://www.behindthename.com/name/aiden/top/england-wales?compare=aidan

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https://www.behindthename.com/name/aiden/top/netherlands?compare=aidan
https://www.behindthename.com/name/aiden/top/france?compare=aidan

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Just take a look at Brayden, Brianna and Lacey and see.
https://www.behindthename.com/name/brayden
https://www.behindthename.com/name/brianna
https://www.behindthename.com/name/lacey

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The original spelling of Aidan had about 117k boys with the name in the USA in total according to the USA Social Security Administration since 2021.
https://www.names.org/n/aidan/about

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The 'variant' Aiden is MUCH more popular, at about 234k boys with the name in the USA in total according to the USA Social Security Administration since 2021.
https://www.names.org/n/aiden/about

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The only exception to this is Ireland, where Aidan is the most popular spelling. In Scotland, both spellings are equally a popular.
https://www.behindthename.com/name/aiden/top/scotland?compare=aidan
https://www.behindthename.com/name/aiden/top/ireland?compare=aidan

In 2018, 2 is the most common age for an American (U.S.) Aiden who is registered male with the Social Security Administration. It is the 563rd most common male first name for living U.S. citizens.