See C. Hazen and M. Freeman, ed., Love Always: Patsy Cline's Letters to a Friend (1999); biographies by E. Nassour (rev. ed. 1993), M. Jones (1994, repr. 1999), M. Bego (1995), S. E. Brown and L. F. Myers (1996), and D. Hall (1998); Sweet Dreams (documentary film, 1985).
While usually a feminine diminutive name, from the 18th Century Patsy also came to be used as a nickname for men and boys called Patrick.
With regard to the use of the term, "patsy" to mean "scapegoat," the usage comes from the early 20th Century vaudevillian, Billy B. Van, whose character, Patsy Bolivar, was more often than not an innocent victim of unscrupulous or nefarious characters.