Why does Moll change her name in the novel, Moll Flanders?

When Moll's second husband, the Draper, ends up in prison for failing to pay his debts, he escapes and flees to France, leaving Moll with "a husband, and no husband." Because of the draper's bad credit, Moll changes her name to Mrs. Flanders and moves to the Mint, a neighborhood where debtors find legal sanctuary.