English: topographic name for someone who lived by a rocky crag
or outcrop, from Old French roche (later replaced in England by
rock, from the Norman byform rocque), or a habitational
name from any of the places named with this word, such as Roach in
Devon, or Roche in Cornwall and South Yorkshire.
English and Irish
(of Norman origin): habitational name from any of various places in
Normandy, as for example Les Roches in Seine-Maritime, named with Old
French roche, or from Roche Castle in Wales.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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