Pax

Also, it seems it's very popular as a male name in the DR Congo.
(Sources:
• https://forebears.io/forenames/pax
• https://www.linkedin.com/search/results/people/?firstName=Pax&geoUrn=%5B%22101271829%22%5D&lastName=%2B&origin=FACETED_SEARCH&sid=!pC )

In the US, it's way more common as a masculine name. It became popular in the 2010s due to its similarity to other names like Max, Dax and Jax. Therefore, the gender of this name should probably be changed to "Feminine & Masculine" (Source: https://www.behindthename.com/top/beyond?name=Pax&gender=&type=sample)

Pax was also used as a masculine name in the Latin language and in the Roman Empire. Some evidence for this is that Pax was used as a name element in unisex and masculine Latin and Roman names, such as Pacificus. However, Pax is more common for females. So, I think that the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine".

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Sources: https://www.names.org/n/pax/about
https://forebears.io/forenames/pax

Though the entry lists Pax as a feminine name, it is now used by males too, such as Pax Jolie-Pitt, the son of American actors Brad Pitt and Angelina Jolie.

Pax is also a term used within the transportation industry to refer to a passenger or passengers.

I think this works for a boy in addition to girls.

Sounds more like a nickname for Paxton.