apparently from Anglo-French *croteyer = Old French *crotoyer,
from Old French crote, crotte dung of hares, etc.
From: The Master of Game
By Edward, the Second Duke of York.
The Oldest English Book on Hunting
Written Between 1406 and 1413
Edited by William A. Baillie-Grohman and Florence Baillie-Grohman
With a Foreword by Theodore Roosevelt
Chapter II. Of the Hare and of her Nature.