What does Greg stand for?

Gregorowski's Reports of the High Court - A publication (DLA)

Gregory - Botanist in plant scientific name (HUH)

Great Egg Harbor River - Philadelphia, PA - National Park Service designator (NPSD)

Great Egret - Common English name - Scientific name: Ardea Alba - American Ornithologists Union four-character bird identification (IBP)

Gregorian (ROG)

Gregory Manufacturing Company - NCIC trailer make code