This information was taken from an ancestry.com Comment on John Nunn, b. 1450.
"The name Nunn is an old Anglo-Saxon personal name and the family traces back among the oldest of the landed gentry in England, having a coat-of-arms crest and motto, translating from the Latin meaning "Mildly in manner - boldly in action".
Four centuries ago there was a George Nunn in Hanstead. Nunns also in Essex and Suffolk, England and it is recorded the family are still represented there.