Sir Baldwin le Fleming, 5th of Slane, was born about 1300 in slane and married Matilda Maud de Geneville dau of Sir Simon de Geneville. Bladwin le Fleming also had the title Lord of the Manor of Dromconerath. In "The History of the Diocese of Meath" by John Healy, LL.D. Rector of Kells and Canon of St. Patrick's, Dublin:
Appendix: Succession of the Clergy - The date before a name is the date of the commencement of the incumbency.
Union of Ardbraccan, parish of Liscartan: 1638 Samuel Boden
Union of Drakestown, parish of Staholmock: 1769 John Bowden
Union of Drakestown, parish of Cruicetown: 1769 John Bowden
Union of Drumconrath, parish of Syddan: 1769 John Boden
Union of Drumconrath, parish of Killary: 1769 John Bowden
So there is at least come connection between the place the Fleming family lived and the place where the Boden family lived.
There were a great number of children who were the ancestors of Sir Baldwin and the Boden line could have originated through one of them. How are where the name changed from Baldwin or Baudoun to Boden is unclear, but names did change sometimes in the same generation.
In 1828, Mr Bryan made a claim to the title of Lord Slane. His peerage agent was Sir William Betham. Sir William Betham (1779-1853) was Ulster King of Arms between 1820 and 1853 and was a historian and antiquary. Listed in the "Consolidated Index of the Records of the Genealogical Office in Dublin" produced by Sir William, were Boden, Bouden, and Bowden:
Bowden:
- MS223-54 Betham Will Extracts 5/70, 7/31, 19/231 - Lodge 6/87
- MS543-554 Misc. Peds. - see back of Ped. of Sir Henry Browers
Bouden: MS223-54 Betham Will Extracts 6/266
Boden: MS223-54 Betham Will Extracts 14/142, 17/180 or 188
I don't know how I would access the information above. Also, I can't find out who Sir Henry Browers was.