One of the names for God in Sikhism is Waheguru. This is the earliest example I have heard in a Hindi Film Song. Corrections welcome.
Reshmi Roomal (1961), main Ghar Se Bhaag Aayaa Hoon, Manna De, onscrenn Maruti, Paraksh Singh Mauji, Manoj Kumar, Shakila and others.
Now You Know!
