There are multiple origins and translations for the name Ab:
1. Arabic name-giving (الأب) semantics - "father, patriarch", Hebrew form - Av".
2. Diminutive form of the Abdulla/Abdullah in the sense of - "loyal and faithful slave/servant of Allah".
3. Persian name-giving (آب) means - "water, aqua, juice".
4. Shortened form of the names that start with the Ab: Abner, Abbas etc.
May also refer to Ab (feminine name).