2) If we are looking for older manor audits, the same family are living in this farm in years 1850, 1834and 1826. In year 1816 peasants do not have a names, but if we compare names and ages,for sure it's the same family living there.
3) All names are very "latvian", so, if the ancestors came from Sweden, this hasn't happened in 19th century.
4) Farmers without surnames was serfs/bondmans. Can Swedish peoples be serfs/bondmans in Russian land? I'm not sure.