Surname is spelt differently 
DEVEREAX, ROBERT TRAFFORD BLYTON
GRO Reference: 1881 S Quarter in NOTTINGHAM Volume 07B Page 285
Thank you for that; it was annoying me that I couldn't find it.
Trafford sounds like a surname to me, which makes me wonder:
1) If Trafford was a surname that was important to Arthur's parents, perhaps his mother's maiden name?
2) If Arthur was in fact born under the name Trafford, and then his mother remarried to a Devereux and he took on that surname?
Unfortunately, cannot find a marriage of a Trafford to a Devereux, trying a combination of spellings.
Queenie