There are multiple origins, definition and meanings for the name Bak:
1. Kazakh (бақ) and Kyrgyz (бак) name-forming comes from Persian Bakht means - "happy, successful".
2. Derived from Persian (باغ) [baagh] interpretation - "garden, vineyard" or comes from (بغ) [bagh] - "Lord".
3. See English Buck.
4. Derivative form of the Turkic name-forming Bek - "ruler".