Right as I was typing that my husband came in and objected to my thought that "cybermen" was one of the earliest general uses of "cyber." So I found this:
<SNIP>
But where does that elusive cyber come from anyway?
Cybernetics
Before there was cyber-anything, there was the field of cybernetics. Pioneered in the late 1940s by a group of specialists in fields ranging from biology to engineering to social sciences, cybernetics was concerned with the study of communication and control systems in living beings and machines. The interest in how systems work is reflected in the etymology of cybernetic, which comes from the Greek word kubernētēs (κυβερνᾶν

, steersman, from kubernan to steer.
The role played by cybernetics in the growing fields of computer science, biology, and engineering provided the term cybernetic a futuristic sheen. The shortened combining form cyber-, it soon became apparent, offered people perfect fodder for nonce formations. Starting in the 1960s and continuing into the 1990s, the English language saw a proliferation of temporary or nonce words based on cyber, including cybercubicle, cyberfriend, cyberlover, cybersnob, and even adverbs like cyber-sheepishly. The most lasting word creation of the 1960s, though, was certainly cyborg, which, combining the cyb- of cybernetics with the org- or organism, referred to a man-machine being with the capability of self-adapting to new environments.
Even though the term cyborg originated in a scientific publication, the concept quickly became the province of science fiction, with the appearance of cyborg-inspired cybermen on the television show Dr. Who by 1966 and in Martin Caidins 1972 novel Cyborg, which served for the inspiration of the television shows The Six Million Dollar Man and The Bionic Woman.
http://blog.oxforddictionaries.com/2015/03/cyborgs-cyberspace-csi-cyber/
He's now conceded.