Meaning of the name "Dyna"

Folks at HDForums are trying to figure out the significance of the "Dyna" name, as if it has some kind of symbolic or associative meaning with Harley's line of motorcycles.

Are Dynas supposed to be "dynamic", or "dynamite"? Or did a Harley designer name the bike after his first girlfriend, "Dyna"?

So far, no one really seems to know.

One person quoted another website...

Welcome to the nineties, and the Dyna chassis. The Dyna was Harley-Davidson's first CAD-designed model, and featured an advanced engine isolation system. The new set-up allowed more engine shake at idle, but less at speed, resulting in vibration-free mirrors (and seat) during highway cruising. This is opposed to the FXR's slightly-damped, but ever-present vibes. When the FXR fell into extinction in 1995, the humble Low Rider was re-christened the FXDL Dyna Low Rider and given a new skin.

But, that still doesn't explain what exactly how the name "Dyna" came about.

I think "Dyna" to the Harley has the same meaning as "Shadow" to the Honda. It's just a name.