Erst
Origin 1
From Middle English erste, from Old English ǣresta ("first"), from Proto-Germanic *airistaz ("earliest, first"), equivalent to ere + -est. Cognate with North Frisian eerst, ærst ("first"), West Frisian earst ("first"), Dutch eerste ("first"), German erste ("first").
Origin 2
From Middle English erst, arst, erest, from Old English ǣrest ("first, erst, at first, before all"), from Proto-Germanic *airist ("erst"). Cognate with Scots erst ("erst"), Dutch eerst.