Hello Douglas - have been following this with a little interest although I am not connected to this family.
Just a little off the wall thought - have you thought it might be a version of Honorah?
There is an Edward
RISDON, labourer, in
Bristol at about the right time with a daughter Honorah (Norah). Not sure the age would be right as she seems to have been born around 1877 but might be worth a thought.
Apologies if you have already looked into this.
Regards, Patsy - New Zealand