Meaning

originFrom Middle English Yore, Jor, from Old English Earp, corrupted from *Ear + ƿ (abbreviation for ƿæter (“water”)); first element from Brythonic *Isurā with loss of intervocalic s, ultimately from Proto-Indo-European *isərós (“vigorous, quick”), from *eis(ə, related to Sanskrit इषिरम् (iṣiram, “fast, quick”). Compare the Gaulish river Isara.

Etymology from Wiktionary, CC BY-SA 3.0