Olive

Multiple sources define the given name Olive as gender-neutral. A known male bearer of this name is Olive Kilifi (an American rugby union player), listed in the "Namesakes" section of this name.

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Sources: https://en.m.wikipedia.org/wiki/Olive_Kilifi
https://www.behindthename.com/name/olive/top/united-states
https://www.behindthename.com/name/olive/top/france?type=percent
https://forebears.io/forenames/olive

In 2018, 89 is the most common age for an American (U.S.) Olive who is registered female with the Social Security Administration. It is the 1, 762nd most common female first name for living U.S. citizens.

Olive is also used in France. [noted -ed]

Attested to 1296 in England. http://dmnes.org/name/Olive.