Ya

Ya is also used as a masculine name in Chinese. However, it's more common for females. So, I think that the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine". Some evidence for this is that Ya is also used as a name element in unisex and masculine Chinese names, such as Yahui, Yating, and Yazhu.

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Source: https://forebears.io/forenames/ya
https://forebears.io/forenames/yahui
https://forebears.io/forenames/yating
https://forebears.io/x/forenames/yazhu

My name in Chinese class is Jiuya (Jiu Ya). I think Ya wouldn't be used in China on its own.

The critical thing to realize is that this name is more of a component than a full name. It is normally used in combination with another of the "names" listed on the Chinese names page. It will rarely be used on its own; most people will agree that on its own, it's much too short. Not to mention, if you're in a native English-speaking country, it will likely go over quite badly. You're more likely to hear a name such as Ya-Xue or Jiang-Ya than Ya in itself as a name.