The best explanation I have seen is from a small booklet of Rideout genealogy by Mary W. Glenn. Here is an excerpt:
"The name Rideout is explained in History through Surnames by W.O. Hassell. The author uses Chaucer's description of the monk in the Shipman's Tale:
'an officer, out for to ryde, To see hir graunges and hire bernes wyde'
and by that of the monk in the Prologue:
'An outridere, that lovede venerie'
These monks were officers of a monastery whose duty it was to visit and supervise the outlying manors, but the term was not necessarily limited to ecclesiastics.
In the History of the Huguenot Emigration to America by Charles W. Baird, D.D., Antoine de Ridouet, Baron de Sance, a devoted follower of the Duke of Soubise, after the siege of LaRochelle, sought refuge in England for he and his family. Then in 1629, he proposed to form a colony of French Protestants in America, and this was favorably entertained by the government. Plans for the voyage and settlement were drawn up. After many delays, the refugees departed with their final destination the Carolinas. However, they landed in Virginia instead."