There are multiple origins and meanings for the name Oz:
1. Diminutive form of the given name Osbert, Oswald, Ozni etc.
2. Hebrew given name (עוז) means- "strength, fortress, valor, might, vigor, power, vehemence, heroism, main, glory, vigour"
3. Turkish name-giving (Öz) etymology - "pure, true, unadulterated, unmixed; genuine, real; self, core, essence, extract, substance, pith, extraction, content, gist, pulp, soul, kerne".