Board Thread:General Discussion/@comment-1918136-20131020014707/@comment-3060460-20131102153255

50.53.154.87 wrote: It isn't strange to simply refer to him as "Snake", especially since it's the name he's been called in every game based on his story so far. It's Big Boss.

End. Of. Story. Actually, he was only given the title "Big Boss" in the last minute of Metal Gear Solid 3, in which he was called "Snake" the entire time. Plus, he didn't actually take the title Big Boss until the last cutscene of Peacewalker, so MGS3, Metal Gear Portable Ops and Peacewalker, he was referred to as Snake.

On a side note, I find it funny, the first game after taking the title Big Boss(Ground Zeroes), he pretty much just drops it and goes back to being called Snake in The Phantom Pain.