I don't think any of these are directly derived from the German "ur" like aurochs is. Aurora / aurum come from Greek. Auricle and a few others are from Latin a

I don't think any of these are directly derived from the German "ur" like aurochs is. Aurora / aurum come from Greek. Auricle and a few others are from Latin auris, ear. Auspicious comes from Latin "auspex" (bird seer) so the root is avis, bird.