What is "ortac"

Ortac is a small uninhabited islet about west of the coast of Alderney near to the islet of Burhou. It measures roughly , and rises above the sea level.

A.H. Ewen surmised that the rock's name meant "large rock at the edge" from the Norman language or (edge) + etac ( stack). Alexander Deschamps said that the French formerly knew it as "the Eagle's Nest".