It looks like Elizamond/Elizamond Basye was Marshall's brother Elizamond Basye, Jr., son of Elizamond Basye, Sr., and Nancy McClanahan.

Source Information:
Edmund West, comp.. Family Data Collection - Individual Records [database on-line]. Provo, UT, USA: MyFamily.com, Inc., 2000.

Family Data Collection - Individual Records Record
about Marshall Mcclanahan Basye
Name: Marshall Mcclanahan Basye
Spouse: Margaret Mcclanahan Thornton
Parents: Elizamond Basye , Nancy Mcclanahan
Birth Place: Bourbon, KY
Birth Date: 1808
Marriage Place: Bourbon
Marriage Date: 1833
Death Place: Dallas, Dallas, TX
Death Date: 1860

Family Data Collection - Individual Records Record
about Elizamond Basye
Name: Elizamond Basye
Spouse: Nancy Mcclanahan
Parents: Edmond Basye , Winifred Taylor
Birth Place: Prince William, VA
Birth Date: 1752
Death Place: Bourbon, KY
Death Date: October 1824

Family Data Collection - Individual Records Record
about Elizamond Basye
Name: Elizamond Basye
Parents: Elizamond Basye , Nancy Mcclanahan
Birth Place: Bourbon, KY
Birth Date: 1793
Death Place: Shelbyville, Shelby, IL
Death Date: 7 May 1858