Wikipedia
The Lamchin were one of many tribes of the Ohlone (Coastanoan) people, Native Americans who lived along the San Francisco Peninsula. The Lamchin were the native inhabitants of what is now San Carlos, California. Information is sparse and dispersed, coming mostly from Spanish mission records - as the natives had no written language. The collected information follows over 100 years of research by many noted historians. The Lamchin are believed to be extinct - as historical, statistical and limited written accounts would seem to indicate.
Their north-western neighbors were the Ssalson, to the south the SuchihĂn, and to the east the Puichon, respectively in present-day Belmont, California, the southern end of Crystal Springs Reservoir, and Redwood City, California. All the groups are considered part of the Ohlone (or Costanoan) language group. The Ohlone group language has been labeled Utian.
The Lamchin may have had two villages named Ormostac, close to the Ssalson and Cachanigtac, their main village in what is now directly south of the downtown San Carlos. The main village name appears to contain a word for vermin, which the Spanish missionaries translated as las Pulgas (the Fleas). The names still lives on as Alameda de las Pulgas, a local main thoroughfare connecting peninsula towns along the feet of the foothills.
The first native inhabitants were baptized in the missions around 1779, and last around 1790.