Henry Kellett
The name is also used for the Snohomish River, which runs through part of the county, and the City of Snohomish, the former county seat that was renamed after the formation of the county. The current spelling of the name was adopted by the Surveyor General of Washington Territory in 1857, with earlier documents and accounts using alternative spellings. John Work of the Hudson's Bay Company recorded the name "Sinnahmis" in 1824, while the Wilkes Expedition of 1841 used "Tuxpam" to describe the Snohomish River. The same river was named "Sinahomis" by Captain Henry Kellett in 1847, and was accepted by the U.S. government for several years.