Where does “をば” come from?

をば (Japanese) comes from Japanese を, from Proto-Japonic wo — accusative marker; away from, off.

をば (Japanese): Emphatic form of the object marker

Definitions

  1. Emphatic form of the object marker

Ancestry of “をば”, step by step

をば traces back through two separate lines of ancestry.

via Japanese を

StepLanguageWordMeaning
1JapaneseをA case particle; A conjunctive particle, usually...
2Proto-Japonicwoaccusative marker; away from, off

via Japanese は

StepLanguageWordMeaning
1Japaneseはwhat about, where is; Inserted between two verbs...
2Old Japaneseは—
Every word from Proto-Japonic wo →Every word from Japanese を →