Tierney

This name can also be a Feminine name, making this name Unisex—as seen in the Popularity chart for England and Wales.
As of January 2022, this name is not listed as unisex and feminine anymore. It changed back to being similar to the 2007 revision, being listed Masculine only and removed the usage "English (Rare)"!

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https://www.behindthename.com/name/tierney/top/england-wales
https://www.nancy.cc/baby-name/tierney/
https://www.names.org/n/tierney/about
https://www.popular-babynames.com/name/tierney
https://forebears.io/x/forenames/tierney

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https://www.behindthename.com/names/history.php?name=tierney
http://web.archive.org/web/20200105080945/http://www.behindthename.com/name/tierney
http://web.archive.org/web/20200121143627/https://www.behindthename.com/name/tighearnach/tree
https://www.behindthename.com/name/tighearnach/tree
https://www.nancy.cc/2018/12/05/baby-name-tierney/

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Even Wiktionary defines Tierney as a feminine name!
https://en.wiktionary.org/wiki/Tierney

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BTW, it’s also a surname that comes from Irish Ó Tíghearnaigh meaning "descendant of Tighearnach".
https://surnames.behindthename.com/name/tierney

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The user-submitted name: https://www.behindthename.com/name/tierney/submitted?id=434443

Great strong masculine name either as a given name or surname. But definitely masculine.

The name Tierney was given to 47 girls born in the US in 2015.

My daughter's name is Tierney Quinn. Quinn is also a unisex name. She likes Tierney, doesn't like Quinn as much. :) I love her name.

Since the 1880's Tierney hasn't appeared on the top 1000 list.