Have just found some very valuable information on your website. For which many thanks.
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are your Mayo's from St Arvans near chepstow

The Mayo family seems to have moved about a bit. You don't give an indication of dates, so am unsure which generation could be relevant. However, the places are different.

William, son of William and Hannah, baptised 1805 Redmarley D'Abitot
his son John baptised 1849 Donnington
his son Albert baptised 1879 Dymock
his daughter Rhoda born 1898 Newent.

I have not been able to find details of William and Hannah's marriage (possible 1800-1805), so have no idea whether it would fit to any of your Mayo families.

Regards
Judy