noun

• An English surname — famously held by:
• John Locke (1632 – 1704); an influential English philosopher of the Enlightenment and social contract theorist.
• A number of places in the United States:
• An unincorporated community and historic district in Sacramento County, California.
• A township and unincorporated community therein, in Elkhart County, Indiana.
• A township in Ingham County, Michigan.
• A town in Cayuga County, New York, named after John Locke.
• Archaic spelling of lock. [Something used for fastening, which can only be opened with a key or combination.]