Ecmascript was coined by ECMA International when they published the JS standard just to cover their ass and not get sued by Sun. It was never intended to be a name for the language, and has never been treated as such.
That's right -- Sun refused to donate the JavaScript tm to ECMA (now Ecma), MS jumped in and offered "JScript" which no one wanted, so the standard ended up with the ECMAScript name (still five first letters all capitalized), which also no one wanted.