It's not a bad, nor uncommon question, at all.

The answer is no. (Takes bow, leaves stage).

There is a great scarcity of original sources on Muhammad's life entirely -- I discussed this a very long time ago here, and, for a recap of some of the few non-Muslim sources we have, see this post from the FAQ about how we know that he existed.

I'd also point you to an answer I wrote some time ago about the issue of sources and the challenge made by scholars like John Wansborough and Patricia Crone for scholars to start critiquing the sources we have for early Islamic history.

The other issue at play, in all fairness, is that there is the question of what one wants to gain by knowing Muhammad's biography. The traditional narrative told by Muslims is, for example, the one that one needs to understand if one wants to know what Muslims think about him as a person and as a guide for the (im)perfect man, as it were.

The source critical model, which is often favored by academics (and non academics), can reveal a quite different biography, but it can also paint a portrait of him that becomes increasingly unrecognizable to Muslims the more it moves away from the traditional narrative. (There's also the polemical version, which paints Muhammad as all sorts of things, which Muslims today may or may not know about and secretly admire (allegedly) -- that's a different can of worms).

Now, having said all of this, there are epigraphic studies being done in the deserts of Arabia (mostly Jordan) that are revealing that a lot of people from this period wrote stuff on rocks, so it is entirely possible that additional fragmentary evidence will emerge, as have additional sources in Syriac and other languages in the past few decades.

However, as yet, all of this documentary evidence is about Muhammad and the early Muslims' interactions with people away from Mecca--as of now, nothing has emerged about his time in Mecca in any sources except for the sira (biographical literature), and hadith, so by definition part of the Arab/Islamic corpus of sources.