For a pre-1800 author, base the heading on the form of name found in reference sources issued in the person's language or country of residence or activity.  For a post-1800 author, base the heading on the form of name that appears predominantly on the chief source of works by the person issued in his or her own language.

Example 1 (pre-1800 author):

010:  : |a nr 99032297
040:  : |a CtY-BR |b eng |c CtY-BR
100:1 : |a Rooke, John
400/1:1 : |a Rooke, |c Mr. |q (John)
670/1:  : |a Arrian's history of Alexander's expedition, 1729: |b t.p. (Mr. Rooke) dedication (John Rooke)
670/2:  : |a RLIN, 14 Oct. 1999 |b (hdg: Rooke, John, fl. 1729; usage: Mr. Rooke)
670/3:  : |a Brit. biog. index |b (Rooke, John, fl. 1725; classicist)
675:  : |a Concise DNB, 1992

Example 2 (post-1800 author):

010:  : |a nr 00003743
040:  : |a CtY-BR |b eng |c CtY-BR
100:1 : |a Schomberg, J. T. |q (Joseph Trigge), |d 1805-1878
400/1:1 : |a Schomberg, Joseph Trigge, |d 1805-1878
670/1:  : |a Will the farmer benefit by the income of personal property being rated?, 1872?: |b t.p. (J.T. Schomberg, Esq., Q.C., of Lincoln's Inn, and Seend, Wilts.)
670/2:  : |a Boase, F. Mod. Eng. bio. |b (Schomberg, Joseph Trigge; b. 14 Aug. 1805 Hastings, England; d. 28 July 1878 The Lodge, Seend, near Melksham, Wiltshire, England; barrister)