The Bergman post office opened in 1894 and was moved to Aguanga in 1901. The name honored Jacob Bergman, an early driver and agent for the Butterfield Overland Stage and Civil War veteran who later owned the Dutchman's or Gifthaler Ranch on which the old Tejungo Station was located. Jacob Bergman was a postmaster for the area for many years and a San Diego County Supervisor.
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Clovis, Calif.: Word Dancer Press. p. 1387. ISBN 1-884995-14-4.
- Frickstad, Walter N., A Century of California Post Offices 1848-1954, Philatelic Research Society, Oakland, CA. 1955, pp. 126-135
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