Ruby

Ruby was also an archaic English diminutive of Reuben.

Ruby is also used as a masculine given name in English, either in reference to the gemstone or as an English diminutive of Reuben, Ruben, Rubin, etc., used alongside Rube. However, it's more common for females. So, I think that the "Gender" of this name should be updated from "Feminine" to "Feminine & Masculine". Some notable male bearers of this name are Ruby from the Pokémon Adventures manga series and Ruby in the 2005 animated film Barbie: Fairytopia.

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Sources: https://en.m.wikipedia.org/wiki/Ruby_(given_name)
https://en.m.wikipedia.org/wiki/Pok%C3%A9mon_Adventures
https://en.m.wikipedia.org/wiki/Barbie:_Fairytopia

It’s too bad more September babies are named Ruby according to namedats.com:(

In 2018, 83 is the most common age for an American (U.S.) Ruby who is registered female with the Social Security Administration. It is the 298th most common female first name for living U.S. citizens.

Attested to 1581 in England. http://dmnes.org/name/Ruby.

Ruby can come from Dollar Scotland because of the child that was found at a door step that was given the name of Ruben Dollar and Ruben is the boy version of Ruby.

Quite often this name is still thought of as an old lady's name, but in 2006 the name shot up to no.4 in the top 10 in England and Wales. A lot of little Rubys born that year were named after the teen tearaway and gangster's daughter Ruby Allen in the British soap EastEnders.