Here's why I think Microsoft nailed the concept in naming their product line.
A surface, to me, is something we're constantly in touch with. Our lives don't function without them. It's, literally, everywhere. The chair you're sitting on has a surface, the keyboard I'm typing with has one, and so is the screen you're reading this on. The concept of always physically being in 'touch' with something means that we're definitely going to interact with it in some way or the other. Now, I don't think it's hard to guess that Microsoft is also in the business of... yep, 'interactive' tech products.
How much do I love the name 'Microsoft Surface'? A lot, it did to the Surface something what Steve Jobs did to the iPhone, he made it my phone. They really dove deep into something so simple — human nature. I mean, that's Microsoft's uniqueness, isn't it? Microsoft created a windows for us to be in touch with them, and now, they've given us a surface as big as a 28" screen with 13,500,000 pixels to express ourselves on. They're learning quite a lot from human nature, and I can't wait to see what their next product, the Surface Duo, has in store for us.
If you've got another perspective, comment below and tell me... what does 'surface' mean to you? I'm curious.