Where does “第九” come from?

第九 (Japanese) comes from Japanese 九, from Old Japanese 九.

第九 (Japanese): the ninth

Definitions

  1. the ninth

Ancestry of “第九”, step by step

第九 traces back through two separate lines of ancestry.

via Japanese 九

StepLanguageWordMeaning
1Japanese九nine; ninth; the ninth
2Old Japanese九—

via Japanese 第

StepLanguageWordMeaning
1Japanese第ordinal marker, often with affix 号
Every word from Old Japanese 九 →Every word from Japanese 九 →
第九 — Etymology, Origin & Word History | Etymology Explorer