A post office operated at Yam from 1911 to 1912, when service was moved to Winton. The name comes from the abundance of yams being grown in the area.
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Clovis, Calif.: Word Dancer Press. p. 792. ISBN 1-884995-14-4.