Where does “onstage” come from?

I need to work through this chain carefully, but I notice there's a significant problem: the chain provided doesn't actually support a coherent etymology for "onstage." The chain shows: - English on - Japanese 音読み (on'yomi - a reading method) - Japanese 音 (on - sound) - Proto-Indo-European wen- (to desire/strive) - Latin sto (to stand) - Proto-Indo-European steh₂- (to stand) - Latin ex (out of) - Latin ex (repeated) This chain is internally inconsistent and doesn't lead to "onstage" in English. The Japanese terms wouldn't etymologically connect to an English word formed from "on" (the English preposition) + "stage." Additionally, the Proto-Indo-European and Latin elements don't form a logical progression to either English "on" or

onstage (English): On the part of a stage that is visible to the...

Definitions

  1. On the part of a stage that is visible to the...

Ancestry of “onstage”, step by step

onstage traces back through two separate lines of ancestry.

via English stage

StepLanguageWordMeaning
1EnglishstageA phase; A platform; a surface, generally...
2Frenchstageinternship, job that a trainee is doing in a...
3Old Frenchestationgarrison; pause; break; visit to a church for...
4Latinstatiōoutpost, picket
5Latin-tiōtion, -ation, -ing
6Latindissertātiō(spoken) dissertation, discourse, disquisition
7Latindissertusarranged, disposed; explained
8Latindissereresecond-person singular future passive indicative...
9Latindis-asunder, apart, in two; reversal, removal;...
10Latincalceusshoe
11Latincalxlimestone; chalk; the finish line
12Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English on

StepLanguageWordMeaning
1EnglishonIn the state of being active, functioning or...
2Middle Englishonon, in; on; Alternative form of oon
3Old Englishonon, in, at, among; from
4Proto-West Germanicanaon
5Proto-Germanic*an
6Proto-Germanicanaon, at; on, onto; ana
7Proto-Indo-Europeanh₂en-on, onto
Every word from Ancient Greek χάλιξ