We kind of take it for granted now after 35-odd years, but the name The Force really is quite brilliant.
What's the origin and story behind (I'm assuming) George Lucas coming up with it?
The rabbit hole goes even deeper: One of the audio sources Lipsett sampled for 21-87 was a conversation between artificial intelligence pioneer Warren S. McCulloch and Roman Kroitor, a cinematographer who went on to develop Imax. In the face of McCulloch's arguments that living beings are nothing but highly complex machines, Kroitor insists that there is something more: "Many people feel that in the contemplation of nature and in communication with other living things, they become aware of some kind of force, or something, behind this apparent mask which we see in front of us, and they call it God."
When asked if this was the source of "the Force," Lucas confirms that his use of the term in Star Wars was "an echo of that phrase in 21-87." The idea behind it, however, was universal: "Similar phrases have been used extensively by many different people for the last 13,000 years to describe the 'life force,'" he says.
Source: Wired - Life After Darth
Lucas has attributed the origins of "The Force" to a 1963 abstract film by Arthur Lipsett, which sampled from many sources.
"Many people feel that in the contemplation of nature and in communication with other living things, they become aware of some kind of force, or something, behind this apparent mask which we see in front of us, and they call it God."
There you go.
One source may be Edward Bulwer-Lytton's vril. In his 1871 novel The Coming Race, reprinted as Vril, the Power of the Coming Race, Bulwer-Lytton refers to "the vril power" and "the terrible force of vril".
The novel is out of copyright and published online here.
"What is the vril?" I asked.
Therewith Zee began to enter into an explanation of which I understood very little, for there is no word in any language I know which is an exact synonym for vril. I should call it electricity, except that it comprehends in its manifold branches other forces of nature, to which, in our scientific nomenclature, differing names are assigned, such as magnetism, galvanism, &c. These people consider that in vril they have arrived at the unity in natural energetic agencies, which has been conjectured by many philosophers above ground, and which Faraday thus intimates under the more cautious term of correlation:
"I have long held an opinion," says that illustrious experimentalist, "almost amounting to a conviction, in common, I believe, with many other lovers of natural knowledge, that the various forms under which the forces of matter are made manifest, have one common origin; or, in other words, are so directly related and mutually dependent that they are convertible, as it were into one another, and possess equivalents of power in their action. These subterranean philosophers assert that by one operation of vril, which Faraday would perhaps call 'atmospheric magnetism,' they can influence the variations of temperature--in plain words, the weather; that by operations, akin to those ascribed to mesmerism, electro-biology, odic force, &c., but applied scientifically, through vril conductors, they can exercise influence over minds, and bodies animal and vegetable, to an extent not surpassed in the romances of our mystics. To all such agencies they give the common name of vril."
"I have spoken so much of the Vril Staff that my reader may expect me to describe it. This I cannot do accurately, for I was never allowed to handle it for fear of some terrible accident occasioned by my ignorance of its use; and I have no doubt that it requires much skill and practice in the exercise of its various powers. It is hollow, and has in the handle several stops, keys, or springs by which its force can be altered, modified, or directed--so that by one process it destroys, by another it heals--by one it can rend the rock, by another disperse the vapour--by one it affects bodies, by another it can exercise a certain influence over minds. It is usually carried in the convenient size of a walking-staff, but it has slides by which it can be lengthened or shortened at will. When used for special purposes, the upper part rests in the hollow of the palm with the fore and middle fingers protruded. I was assured, however, that its power was not equal in all, but proportioned to the amount of certain vril properties in the wearer in affinity, or 'rapport' with the purposes to be effected."