Where does “가얏고” come from?

가얏고 (Korean) comes from Korean 고, from Chinese 古, from Proto-Sino-Tibetan r-ga — old.

Ancestry of “가얏고”, step by step

가얏고 traces back through two separate lines of ancestry.

via Korean 고

StepLanguageWordMeaning
1Korean고and then; and; -ing
2Chinese古—
3Proto-Sino-Tibetanr-gaold

via Korean 가야(伽倻)

StepLanguageWordMeaning
1Korean가야(伽倻)—
Every word from Proto-Sino-Tibetan r-ga →Every word from Chinese 古 →Every word from Korean 고 →