The Greek name Ἰάκωβος is translated as "James" in English Bibles for political reasons--always s good idea to suck up to the Boss. But in Spanish Bibles the same Greek name is always "Jacobo" except in the books of James and Jude, where it is "Santiago."1777.James.xlsx
I have always understood that the Book of James was written by the same person as James in Acts 15, the (half-) brother of Jesus.
After digging through all my Logos resources, I'm no nearer to an answer. Can you tell me where to look, so I can explain this to my Spanish-speaking brothers?