Etymology
From Middle English greve, from Old English grǣfe, grǣfa (“bush, bramble, grove, thicket, copse, brush-wood (for burning), fuel”), probably related to Proto-Germanic *grōbō (“ditch, hole”).
Cognate with Scots greve, greave (“grove”). Compare also Proto-Germanic *grainiz (“twig”), of unknown origin, whence Old Norse grein (“branch, bough”). Closely related to Old English grāf, grāfa (“grove”). See grove.