There are multiple origins and translations for the name Basia:
1. West Slavic (Polish) form of the Greek name Barbara interpretation - "foreign woman, she-stranger/traveler". See Basya.
2. Diminutive form of the Hebrew name Bathsheba means - "daughter of the oath".
3. Derived from the ancient Greek (βασίλισσα) [vasilissa] - "queen; royal", the female equivalent of the Greek male name Basil.