Robin was a Northumbrian lad. Allen a Dale was clearly from Allendale.
The rigorously researched "Robin Hood:Prince of Thieves" shows Robin to have lived near Hadrian's wall.
"Nottingham" is a misreading of Eltringham,Ovingham or Bellingham.
"Sherwood" is a corrubtion of "Shearer's Wood" (Shearer being one of the most revered Northumbrian Deities).
Oh yes & "Norman" should read "Mackem"