Anglo-Saxon, Suth-rea (south of the river —i.e. the Thames), or Suth-rie (south kingdom).
Saddle White Surrey for the field tomorrow
Surrey is the Syrian horse, as Roan Barbary in Richard II.
is the Barbary horse or barb. (See
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894