It's a bit of a quirk of English, but the term "fellow" is generally considered masculine.
Here are a few reasons why:
* Historically: The word "fellow" has traditionally been used to refer to men.
* Usage: We typically use "classmate" or "schoolmate" as more gender-neutral terms.
* Context: While you could technically use "class fellow" to refer to a woman, it's not common and can sound slightly outdated.
To avoid confusion or gender bias, use "classmate" or "schoolmate" instead.