An Etymological Dictionary of the German Language/Ernte
Ernte, f., ‘harvest,’ from the equiv. MidHG. ęrne, f., like ModHG. Hüfte, from the equiv. MidHG. hüffe, plur. of huf; MidHG. erne (Franc. and Alem. ärn), a plur. used as a sing., is related similarly to OHG. aran, ‘harvest,’ which, like Goth. asans, ‘harvest, autumn,’ is connected with a root as, ‘to work in the fields,’ widely diffused in OTeut. Comp. Goth. asneis (OHG. ęsni, AS. ęsne), ‘day-labourer,’ OIc. ǫnn (from *aznu), f., ‘work, season for tillage’; akin to OHG. arnôn, ‘to harvest’ (AS. earnian, equiv. to E. to earn, OIc. árna?), MidHG. asten, ‘to cultivate.’ Probably Lat. annôna (for *asnôna), ‘produce of corn,’ belongs to the Teut. root as.