My reasoning went as follows: Well known book, forum with three languages, same letters for everyone. It had to be a title that was not translated at least across these three languages. How many of those are there? It was a high probability it was a name, and after three letters, I already suspected what the name was.
But it was fun looking for the letters. I actually miss beginning my day with a search. Could we possibly continue the challenge? No need for prizes this time