Let's hear it for the S names.

Sachi (f)   Bringer of bliss, origin - Japanese
Sadiya (f)  Lucky, origin - Arabic
Safia (f)   Lion's share, pure, best friend, untroubled, origin - Arabic, Hindi, Swahili
Sai (f)     Tree, fortress, stronghold, origin - Japanese

Sankara (m) Lucky, fortunate, origin - Sanskrit
Sef (m)     Yesterday, origin - Egyptian
Shastra (m) Giver of instructions, origin - Sanskrit