What is the name/version number of the stock browser that comes on Android 2.3?

I am doing research on mobile web design for an upcoming project and part of what I need to find is the marketshare of mobile browsers so we can determine which ones we will support. I have found statistics of mobile browser marketshare but I now need to clarify exactly what I am seeing. I see statistics for "Android Browser 4.0" and I *assume* it is the stock browser for Android 4.x devices. But if that were true I would expect to see statistics for an "Android Browser 2.0" or "Android Browser 3.0" in the statistics but I do not. I can't imagine that all Android 2.x users don't surf the Internet or use non-default browsers so it appears that my assumption is incorrect. So what is the name/version number of the stock browser in Android 2.3 (or all 2.x) devices?