Where does “gastnesse” come from?

gastnesse (Middle English) comes from Middle English gast, from Middle English gasten, from Old English gǣstan, from Proto-West Germanic *gaistijan, from Proto-Germanic gaistijaną.

Ancestry of “gastnesse”, step by step

StepLanguageWordMeaning
1Middle Englishgast—
2Middle Englishgastento terrify
3Old Englishgǣstanto gast, frighten, afflict, torment; to torment,...
4Proto-West Germanic*gaistijan—
5Proto-Germanicgaistijaną—
Every word from Proto-Germanic gaistijaną →Every word from Proto-West Germanic *gaistijan →Every word from Old English gǣstan →