Where does “Tjerkgaast” come from?

Tjerkgaast (Dutch) comes from Old Frisian gāst, from Proto-Germanic *gaist, from Proto-Germanic gaistaz, from Proto-Indo-European ǵʰeysd- — anger, agitation.

Ancestry of “Tjerkgaast”, step by step

StepLanguageWordMeaning
1Old Frisiangāstghost, spirit
2Proto-Germanic*gaist—
3Proto-Germanicgaistazterror, fear; spirit, ghost; mind
4Proto-Indo-Europeanǵʰeysd-anger, agitation
Every word from Proto-Indo-European ǵʰeysd- →Every word from Proto-Germanic gaistaz →Every word from Proto-Germanic *gaist →