Where does “joiner” come from?

I can't write this summary because the etymology chain provided doesn't support the word "joiner." The chain shows the suffix "-er" (agent noun marker) and its origins, but doesn't explain how it attaches to "join" or trace "join" itself back through the languages listed. Additionally, the inclusion of Chinese 兒 in a Latin-to-English chain is linguistically implausible and lacks clear connection to the other elements. To write an accurate one-sentence summary, I would need either: - A corrected chain that traces "join" through its actual etymological path, or - Clarification on how these elements combine to form "joiner" Could you verify the etymology chain?

joiner (English): A maker of wooden furniture or fittings; A...

Definitions

  1. A maker of wooden furniture or fittings; A...

Ancestry of “joiner”, step by step

joiner traces back through two separate lines of ancestry.

via English join

StepLanguageWordMeaning
1EnglishjoinAn intersection of piping or wiring; an...
2Middle Englishjoinento join
3Old Frenchjoindreto meet up with; to go and see; to join; to join...
4Vulgar LatinjuniorAlternative form of iūnior
5Latiniūnior
6Latiniuvenioryounger, more youthful
7Latiniuvenisyoung; A youth, a young man, young woman, young...
8Proto-Italic*juwōyoung

via Middle English joynour

StepLanguageWordMeaning
1Middle Englishjoynourmaker of furniture, small boxes, etc
2Old Frenchjoigneorjoiner, carpenter

Words derived from “joiner

Every word from Proto-Italic *juwō