hevva

The story

1. Welsh · derived fromhaid“a swarm”
2. Welsh · derived fromhedfa“swarming, flocking”
3. Old Cornish · derived fromhedva
4. Cornish · borrowed fromhevva
5. English todayhevva

From the Cornish hevva, a contracted form of the Old Cornish hedva, from Welsh hedfa (“swarming, flocking”), from Welsh haid (“a swarm”).