Sid

Sid is also used as a feminine name in English, as a short form of Sidney. However, it's more common for males. So, I think that the "Gender" of this name should be updated from "Masculine" to "Masculine & Feminine".

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Source: https://en.m.wikipedia.org/wiki/Sid_(given_name)

In 2018, 50 is the most common age for an American (U.S.) Sid* who is registered male with the Social Security Administration. It is the 6, 200th most common male first name for living U.S. citizens.

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*as a first name, not a nickname.

Why is this listed as only a masculine name? It's also a common nickname for GIRLS named Sidney, like (for example) one of my friends, and my aunt. I've always gotten a bit of a chuckle out of the fact that I have an aunt named Sid(ney), and another named Nancy.