[dkersten]

Just rename it to "JS" (jay-ess) and forget about having the letters stand for anything.

[1bpp]

Would be nice if Microsoft hadn't taken JScript

[WorldMaker]

Microsoft themselves have even suggested the community could take over the name JScript if they want and offered the trademark to community groups.

[leptons]

Or how about just "J", like "C", and "B" before it.

[dkersten]

Already taken https://en.wikipedia.org/wiki/J_(programming_language)