The (former?) master list https://meta.wikimedia.org/wiki/User:Cbrown1023/Logos is silent on English names of languages; in CLDR http://www.unicode.org/cldr/charts/dev/summary/en.html#14 we have "Achinese".
(Restoring CirrusSearch since these messages have been added solely for CirrusSearch and are not used by anything else as far as I know; see also T143355: request translations for 'showing results from'.)
@Nikerabbit - I'm not sure. Using this query: https://translatewiki.net/wiki/MediaWiki:Search-interwiki-results-acewiki/qqq
I get this response:
Search results description for Acehnese Wikipedia. This message contains a language name. The translation (if present) in CLDR is "Achinese".
It's probably a bit too soon for the train to have made the updates yet (as of Wednesday morning).