The Assateague Pony takes its name from Assateague Island, a 37-mile barrier island extending along the Atlantic coasts of Maryland and Virginia where these feral horses have lived for centuries. The name "Assateague" derives from a Native American word, though its exact origin and meaning remain disputed among historians. These ponies are often called "Chincoteague Ponies" particularly when referring to the Virginia herd managed by the Chincoteague Volunteer Fire Company, which conducts the famous annual Pony Swim and auction that brings these animals to public attention each July. The distinction between "Assateague" and "Chincoteague" reflects geography—Assateague is the barrier island where ponies live year-round, while Chincoteague is the nearby island where Virginia's ponies swim annually for health checks and auctions. Both names refer to the same basic population, though technically "Assateague Pony" encompasses all island horses while "Chincoteague Pony" specifically references the Virginia herd.
The Chincoteague Pony Association serves as the breed registry for ponies sold from the Virginia herd, maintaining pedigrees and breeding records for domesticated descendants of island stock. Only ponies directly descended from Assateague Island bloodlines qualify for registration, preserving genetic links to the feral population. The registry documents each pony's lineage, brand numbers from their time on the island, and subsequent breeding if used in domestic programs. This registration system helps maintain the unique characteristics and heritage of Assateague bloodlines while creating a market for ponies purchased at the annual auctions. The Maryland herd, managed by the National Park Service within Assateague Island National Seashore, is not available for private ownership and receives different management focused on population control through contraception rather than removal and auction.
Historically, various theories explain how horses arrived on Assateague Island, with the most romantic suggesting they swam ashore from a Spanish galleon shipwrecked off the coast in the 16th century. While this legend persists in popular imagination, particularly in children's literature about these ponies, historical evidence suggests more prosaic origins. Most historians believe colonists brought horses to the barrier islands in the 17th century for grazing, avoiding mainland fencing requirements and taxes on livestock. The harsh island conditions, isolation from mainland horse populations, and centuries of natural selection without significant human intervention created the distinctive pony type observed today—compact, hardy animals adapted to surviving on salt marsh grasses, tolerating extreme weather, and thriving in an environment that would challenge most domestic horses. Regardless of their exact origins, these ponies have become iconic symbols of American coastal wildlife and equine resilience.

