As has been stated. You will probably see the name(s) of the ones used by people in certain posts, however, we don't really talk about it much other than that they exist. I don't think I have ever seen a 3DS emulator though, just older systems/consoles. The 3D part of the 3DS I believe would give problems for many games that were only designed for 3D only anyway and you are simply better off using a 3DS like everyone else 😀
That being said, it wouldn't really surprise me if we start to see some of the Nintendo games being released on PC if Nintendo continues to struggle with their next console release. Smartphones and tablets are really eating into their market (which they previously dominated the handheld market).