Gabby

This name can also be used as a Masculine name in the Philippines as a diminutive of Gabriel, making this name Unisex.
https://www.behindthename.com/name/gabriel
https://forebears.io/x/forenames/gabby

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https://en.wikipedia.org/wiki/Gabby_Concepcion
https://en.wikipedia.org/wiki/Gabby_Hartnett
https://en.wikipedia.org/wiki/Gabby_Pahinui

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As a Feminine name, it's also a diminutive of Gabriella and Gabriela.
https://www.behindthename.com/name/gabriella
https://www.behindthename.com/name/gabriela

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As of December 8th 2022, this name is not listed as 'Unisex' anymore...now being listed as just 'Feminine'.
https://www.behindthename.com/names/history.php?name=gabby

Gabby is also used as a diminutive of Gabriella, Gabriela, Gabriel, etc. Gabby is also used as a masculine name in English, as a diminutive of Gabriel. So, I think that the "Gender" of this name should be updated from "Feminine" to "Feminine & Masculine".

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Source: https://en.m.wikipedia.org/wiki/Gabby

Gabby can also be used as a diminutive of Gabriella or Gabriela.

For a boy named Gabriel use Gabe, For Gabrielle/Gabriellas Gabby is good.

My name is Gabriella and I use Gabriella in a formal setting when I don't know people or if I have to deal with people in business or I plain don't like them.

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I am known as Gabby because I am talkative and rather Gobby but Gabby is a term of endearment for someone like family or a boyfriend to use but no one else.