[wwwigham]

ES2017 is the conventional name now that there's annual publications of the spec. ES8 is someone reading the edition number on the document and trying to be terse. ECMA-262 is the formal name of the spec document, not the language the spec defines. All slightly different things, only one of which names the language itself, officially.

[jl6]

Which one is it that names the language officially?

[JeremyBanks]

ECMAScript 2017, that's the name given by the speciation document, which is itself known officially as ECMA-262 edition 8.

[PrunJuice]

So which name is the correct one?

[komali2]

Ecmascript 2017.