HARPER Lydbrook / Ruardean (General)
Harper is a well established name in this area; I'm not sure of your Dunn line but as you say it is more than possible that the link is a little indirect - by a marriage to a Knight, Matthews, Watkins etc
Equally I grew up with many "cousins" who my research now tells me should to be family friends :-(
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Ἀριστοτέλης A Gloster & Hereford Boy in the Forest of Dean ><((((*>