Sasha

Borrowed from the Slavic diminutive form of Alexander and Alexandra; in English mostly from Russian Са́ша (Sáša), a diminutive form for both Алекса́ндр m (Aleksándr, “Alexander”) and Алекса́ндра f (Aleksándra, “Alexandra”).

From the ending of Natasha, but likely influenced by the Slavic diminutive form of Alexandra.