Where does “横書き” come from?

横書き (Japanese) comes from Japanese 書く, from Proto-Japonic kaku, from Kapampangan aku, from Proto-Philippine *aku, from Proto-Malayo-Polynesian aku, from Proto-Austronesian aku.

横書き (Japanese): horizontal writing, especially from left to right

Definitions

  1. horizontal writing, especially from left to right

Ancestry of “横書き”, step by step

横書き traces back through two separate lines of ancestry.

via Japanese 書く

StepLanguageWordMeaning
1Japanese書くto write; to record (words, figures) on the surface of (something)
2Proto-Japonickakuto scratch; to write
3KapampanganakuI; me; my
4Proto-Philippine*aku—
5Proto-Malayo-Polynesianaku—
6Proto-Austronesianaku—

via Japanese 横

StepLanguageWordMeaning
1Japanese横side
2Middle Chinese橫—
Every word from Proto-Austronesian aku →Every word from Proto-Malayo-Polynesian aku →Every word from Proto-Philippine *aku →