Where does “agastra” come from?
agastra (Old Dutch) comes 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 “agastra”, step by step