What gender are Vanya, Anya, Ana?

Hello! The title is pretty ambiguous.

So, I'm form Slovenia and a name of mine is "Vanja"; wich here is theorically masculine. But I've heard a lot of russian women (or non-binary people) call themselves Vanya, as if in Russia it was unisex/feminine.

The same occurred with Anja, which in my region's unisex, but it seems to be totally femenine in russian.

The thing surprised me the most was hearing a man named "Ana", tipically feminine.

So I know it won't be useful, but my question was in fact what gender are considered those names for russians, or if there must be certain rules or contexts. Thanks