Paulette: I don't have an answer to your question, but can provide 'some' info on the only "Keziah" Alexander's that I am familiar with.
James Alexander 'yeoman' (c1688/89-1772) had a daughter named Keziah Alexander (1720-1751). She was married to Walter SHARP c1739 Cecil Co, MD. She predeceased her father, so is not named in his Cecil Co, MD LW&T, but her own LW&T identifies her sister, Jemima (Alexander) Sharp, her brothers, Amos Alexander, Hezekiah Alexander, John McKnitt Alexander and her 'honored father, James Alexander' -- as well as several SHARP in-laws."This" Keziah Alexander Sharp had a daughter named Keziah Sharp, but I don't have any further information on the daughter.The fact that his granddaughter, Keziah Sharp, was NOT named in James 'yeoman' 1772 LW&T 'could' mean that she was also deceased, but that is speculation.
The oldest son of James Alexander 'yeoman', TheophilusAlexander (1714/15-1768) had a daughter named Keziah Alexander (c1740-c1819).Theo's 1768 LW&T identifies his daughter Keziah, but doesn't mention a married name.According to info I have seen, 'this' Keziah Alexander married Joseph Young.I don't have solid documentation on this marriage, but I don't have reason to doubt it.
Another son of James Alexander 'yeoman', Hezekiah Alexander (1722-1801) also had a daughter named Keziah Alexander (c1771-1818). She never married, but had at least one son with 'a' Elias Alexander. She's too young to have been the wife of Zaccheus Wilson, however.
I can't find any other "Keziah" Alexander's in my files, but I can't claim to be an expert on the very large, very messy ALEXANDER family in Maryland and North Carolina.[I am a descendant of William Sample Alexander, the oldest son of Hezekiah Alexander.I've done a lot of research on the children of Wm. Sample Alexander & his three wives, but have found no evidence of another "Keziah" in this 'branch' of ALEXANDERs.]
Carol Vass Kent, WA
PS:In my genealogy files, I've found about 8 or 9 other young women with the name "Keziah" -- none of whom are in any way connected to the Cecil/Mecklenburg ALEXANDERs, so while it is a distinctive name, it was used in other families too.