What is the meaning of Rajesh in Telugu?

Compound name derived from the Sanskrit raja (king) and Tsa (ruler): hence, the king is ruler, king of kings..

The compound name is analysed as 'Raja(on) ka Ishwar', which would mean God of Kings (rather than King of Kings). The Name denotes the Lord Siva (Sambhu).

So in Sanskritized Telugu the name itself defined as "God of Kings"