Nancy was named for Nancy Ann KINCHELOE STRIBLING, her maternal grandmother.
Nancy's mother was Catherine STRIBLING. There is no credible evidence that Catherine had a middle name or a middle initial.
Some "researchers" have apparently simply copied unsourced, erroneous information about Catherine's having had a middle name (Taliafero), and that apparent error has spread through internet postings as fast and far as a kudzu vine on a warm summer night.
[Note: Kudos and thanks to STRIBLING descendant and Find A Grave contributor Elreeta Weathers for providing some of this bio information about Nancy. Elreeta is a noted and leading researcher in her STRIBLING ancestry].