Calling all Supernatural Fans

I was thinking of writing, more that I was thinking of writing the... several challenge fics I need to write, and I thought of something:

Does Sam have a middle name? Do either of them?

I've been tooling around on the internet and haven't found conclusive evidence. So, if you have personal fanon about middle names for the boys, or have actually seen it somewhere, I'd like that.

Not that it totally matters, but it's the little things, you know? Appreciate it!