Frances (Francina) Colvill (d. 1773) was the wife of Thomas Colvill and was, along with GW, one of the executors to his estate. In his will, Thomas provided that Frances's niece, Sarah Savin, who would marry William Bernard, should receive £250 current money as well as a slave girl (see Ledger B, 21; Ledger C, 13).

In October 1766 GW loaned Frances £10, which she repaid in April 1767 (see Ledger A, 234, 249).