Where does “のだ” come from?

のだ (Japanese) comes from Japanese だ, from Japanese である, from Japanese で, from Japanese ぜ, from Japanese ぞえ, from Japanese え, from Middle Chinese 衣.

のだ (Japanese): an assertion that emphasizes the cause, reasons, grounds and etc

Definitions

  1. an assertion that emphasizes the cause, reasons, grounds and etc

Ancestry of “のだ”, step by step

のだ traces back through two separate lines of ancestry.

via Japanese だ

StepLanguageWordMeaning
1JapaneseだFollowing parts of speech that do not inflect by...
2JapaneseであるTo be: the copula, with the same function as だ and its polite form です
3Japaneseでat; with, by, using; indicating the following...
4Japaneseぜsentence-ending particle signifying emphasis,...
5Japaneseぞえ­ sentence-ending particle signifying emphasis, used to lightly press one's point, with affectionate overtones
6JapaneseえAlternative form of い
7Middle Chinese衣—

via Japanese の

StepLanguageWordMeaning
1Japaneseのgenitive case marker; nominative case marker in a...
2Old Japaneseのplain, field
3Middle Chinese能talent, ability
Every word from Middle Chinese 衣 →Every word from Japanese え →Every word from Japanese ぞえ →