Junker Gnome is a name I’ve only heard come up since these cyborg/mechagnomes/junker gnomes(whatever you want to call them) came up at Blizzcon. Notice in this thread most people are pointing to the source of the name coming from some datamined files. However I haven’t seen them called Junker gnomes anywhere in the official ptr or game and official sources take prominence. Like I cannot go around calling orcs Mountain Dew orcs and have it accepted as cannon because I came up with it.
Bottom line. If it isn’t official, it isn’t cannon.