Sasha may also refer to Alexandra, which is a feminine first name. What's more, there's like a ton of diminutive short names for these -- my first ever instagram link on HN, but: https://www.instagram.com/reel/DTUeNn7iAit/

(FWIW, it lists: Sasha, Sashka, Sashulya, Sashenka, Sanya, Sanechka, Sancho, San, Shurik, Sashunya, Sanyusha, Sanyok. I myself have heard native Russians use Sash - should be written as Сашь -, and e.g. Mish - Мишь -, which is a similar "lazy" conversational short form for Misha/Mikhail.

I've learned some Russian, and once you start sensing the endless magic they can do with verb prefixes and sufixes, you realize what a versatile language this is. Somewhat the same counts for first names, I guess.)