I guess we really need to see the Original PR but I certainly have two sources that give it as DONNE and DUNN.
And here is the total list from IGI for all events for the name BUNN or similar.
International Genealogical Index / British Isles - 11
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1. JANE BVN - International Genealogical Index
Gender: Female Christening: 14 FEB 1560 Saint Dominick, Cornwall, England
2. RICHARD BUNS - International Genealogical Index
Gender: Male Birth: 29 FEB 1836
3. RICHARD BUNS - International Genealogical Index
Gender: Male Christening: 28 MAR 1836 Wesleyan Methodist, Liskeard Circuit, Cornwall, England
4. WILLIAM BUNTS - International Genealogical Index
Gender: Male Christening: 21 APR 1782 Mylor, Cornwall, England
5. Mary Bunts - International Genealogical Index
Gender: Female Christening: 04 MAY 1783 Saint Mewan, Cornwall, England
6. John Bunn - International Genealogical Index
Gender: Male Marriage: 15 JUL 1771 Of Milor, , Cornwall, England
7. SARAH BUINE - International Genealogical Index
Gender: Female Marriage: 22 APR 1757 North Hill, Cornwall, England
8. KATHERINE BUNS - International Genealogical Index
Gender: Female Marriage: 21 DEC 1764 Saint Teath, Cornwall, England
9. MARY BUNN - International Genealogical Index
Gender: Female Marriage: 16 JUN 1654 Budock, Cornwall, England
10. John Bunn - International Genealogical Index
Gender: Male Marriage: 15 JUL 1771 Of Milor, , Cornwall, England
11. John Bunn - International Genealogical Index
Gender: Male Marriage: 14 MAR 1799 Sithney, Cornwall, England
I am inclined to go with DONNE/DUNN myself.