Where does “exster” come from?

exster (Dutch) comes from Middle Dutch egestre, from Old Dutch agastra, from Proto-West Germanic agastrijā, from Proto-West Germanic ag-ad- ~ ag-at-, from Proto-West Germanic agu, from Proto-Germanic agō, from Proto-Indo-European h₂oḱ-éh₂, from Proto-Indo-European h₂eḱ- — sharp.

Ancestry of “exster”, step by step

StepLanguageWordMeaning
1Middle Dutchegestre—
2Old Dutchagastra—
3Proto-West Germanicagastrijāmagpie
4Proto-West Germanicag-ad- ~ ag-at-—
5Proto-West Germanicagumagpie
6Proto-Germanicagō—
7Proto-Indo-Europeanh₂oḱ-éh₂—
8Proto-Indo-Europeanh₂eḱ-sharp

Words derived from “exster”

Every word from Proto-Indo-European h₂eḱ- →Every word from Proto-Indo-European h₂oḱ-éh₂ →Every word from Proto-Germanic agō →