Sasha is the Russian diminutive of Alexander/Alexandra — from the Greek alexandros, meaning "defender of mankind." In Russia and other Slavic countries, Sasha is used as an everyday name for people named Alexander or Alexandra of any age.
In English-speaking countries, Sasha is used almost exclusively for girls. Sasha Obama (born 2001), daughter of President Barack Obama, is a prominent bearer.
Sasha reduces to four — the number of steady protection.