With time Trilinga became Tenugu and Tenugu became Telugu. These three Shiva Temples are present in three regions (Kosta Andhra, Telangana and Rayalaseema) of Telugu land. Telangana Region which is located approximately amid these three Shiva Temples is named after Trilinga Desa. (Trilinga- Telugu- Telangana).
But some people believe Telugu is still older language and it is mentioned in Aithreya Brahmana of Rigveda. So, wherein Aithreya Brahmana of Rigveda, "Telugu" is mentioned?