Where does “です” come from?

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

です (Japanese): form of to be

Definitions

  1. form of to be

Ancestry of “です”, step by step

StepLanguageWordMeaning
1JapaneseであるTo be: the copula, with the same function as だ and its polite form です
2Japaneseでat; with, by, using; indicating the following...
3Japaneseぜsentence-ending particle signifying emphasis,...
4Japaneseぞえ­ sentence-ending particle signifying emphasis, used to lightly press one's point, with affectionate overtones
5JapaneseえAlternative form of い
6Middle Chinese衣—

Words derived from “です”

Every word from Middle Chinese 衣 →Every word from Japanese え →Every word from Japanese ぞえ →