Johann Gerhard Heinrich Stockmann was born 20 June 1794 in Mettingen, Germany to J. Hermann Stockmann (1758-1816) and Margaretha M.A. Fangmeijer (1761-1832) and died 21 March 1847 Hoogwoud, Netherlands of unspecified causes. He married A.M. Theresia Koeller (1795-1879) .
Gerhard Stockmann was a ropemaker. He moved with all his family from Mettingen to Hoogwoud, where they changed their name to Stokman.
Children
| Name | Birth | Death | Joined with |
| M.A. Theresia Stockmann (1816-1862) | |||
| Gerhard B. Stockmann (1819-?) | |||
| Anna M.A. Stockmann (1821-1858) | 12 April 1821 Mettingen, Germany | 9 November 1858 Hoogkarspel, Netherlands | Simon Korver (1818-1890) |
| Johann B. Stockmann (1823-1823) | |||
| M. Henrica Stockmann (1824-1855) | |||
| M. Franciska Stockmann (1826-1903) | |||
| G. Leo Stockmann (1829-1887) | |||
| Gerhard H. Stockmann (1831-1914) | |||
| Editha M. Stockmann (1835-1921) | |||
Footnotes (including sources)
| ‡ General |