Benjamin Dunn was mentioned in the 5 February 1731 will of his father William Dunn, proved on 19 July 1732. Benjamin was called one of the three youngest sons. [Essex County, Virginia, Will Book 5, pages 92–93.]

The will of Benjamin Dunn was dated 17 April 1778. “In the name of God amen. I Benjamin Dunn of the Parish of Southfarnham and County of Essex do make and ordain this my last will & Testament in manner and form as followeth. I lend to my Beloved wife Elizabeth Dunn all my Estate dureing her Life & at her death to be disposed of as I shall hereafter Direct. Imprimis. I give my land & plantation to be Equilly Divided amongst my three sons Benjamin Dunn Dickinson Dunn and Antoney Crow Dunn to them and their heirs forever. Item. I give to my son Phillip Dunn twenty Shillings Sterling to him and his heirs forever. Item I give to my son Dicinson Dunn my bigest Iron post one feather Bed & furniture & one Cow to him and his heirs forever Item I give to my son Benjamin Dunn one Cow and one Iron pot to him & his heirs forever Item I give to my son Anthoney Crow Dunn one Cow and one Iron pot & one feather bed & furniture to him & his heirs forever. Item I give to my Daughter Judath Crow one feather bed she has now in her possession the Rest of my Estate after the payment of my Just Debts I give to be Equally Divided amongst all my living Children to them and their heirs forever. Lastly I Constitute & appoint Benja. Dunn and Dickinson my Executors to this my last will given under my hand & Seal this 17th of April 1778.” It is not clear from the Will Book whether Benjamin signed with an X, or Benjamin Dunn Senr.
Witnesses: Ben Johnson, Gilletine[?] Man, Frances Dennett.
Proved 18 October 1779.
[Essex County, Virginia, Will Book 13, page 261.]