Abi

Abi could be a nickname for Abigaia, Abilene, Abital, Abia, Abijah, Amabel, Amabilia, Anabel, Anabela, Anabella, Anabelle, Annabel, Annabella, Annabelle, Annabeth, Arabella, Babette, Barbara, Bathsheba, Christabel, Christabella, Christabelle, Elisabeth, Elizabeth, Elsabeth, Fabia, Fabiana, Fabiola, Fabricia, Gabriella, Gabrielle, Isabeau, Isabel, Isabela, Isabell, Isabella, Isabelle, Izabel, Izabella, Izabelle, Mabel, Mabella, Mabelle, Mariabella, Mehetabel, Mehitabel, Mirabella, Mirabelle, Rosabel, Rosabella, Rosabelle, Sabina, Sabrina, Sabryna, Tabatha, Tabitha and Ysabel.

Abi is also used as a masculine name in English, as a diminutive of Abraham, Abram, Albert, Abel, etc. Abi is also used as a unisex diminutive of Abijah. However, it's more common for females. 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/Abby

Abi was a shortened form of Abijah, and was the nickname of a queen of Judah.