Habitational name from one of three places in
Northumberland called
Rochester, with names whose early spellings are very similar and sometimes difficult to distinguish from each other.
Rudchester in
Ovingham is probably the likeliest source of the surname which is concentrated in the southern half of Northumberland but
Rochester parish and a lost
Ruchester in
Chollerton are both possible candidates.
Rudchester in Ovingham may derive from Old Norse
rauthr "red" and Old English
ceaster "(Roman) city, old fortification". Rochester parish derives from an uncertain first element and Old English
ceaster. The lost Ruchester in Chollerton probably derives from Old English
rūh "rough" and
ceaster as does Rocester (Staffordshire) for which see Roster . occasionally a habitational name from the better-known city of Rochester (Kent) recorded by Bede (c. 730) under the names of both Dorubrevi and Hrofæcæstre. The former represents the original British name composed of the elements
duro "fortress" and
brīvā "bridge". The second represents a shortened form of this (possibly affected by folk etymological connection with Old English
hrōf "roof") combined with an explanatory Old English
cæster "Roman fort" (from Latin castra "military camp"). In other cases there may also have been confusion with Wroxeter in Shropshire recorded in Domesday Book as Rochecestre.