Last names became compulsory in Finland only in 1921. There appears to be a divide between the Eastern and Western part of Finland with the East having a longer tradition, starting in the 16th century, of hereditary last names, whereas the West used patronymics and farm names more. A case could be made for using farm names as LNAB because that was the name people were known as. But those names changed if the person moved, often the younger siblings as only the oldest who inherited the farm stayed on. There was a gradual increase in the use of last names during the 19th century, particularly when people moved to the cities. Prior to 1921 then, this is an issue that needs to be decided on a case by case basis: If the name changed with move from one farm to another the patronymic should be used as LNAB and the farm name(s) as Other Names, If the name persists even after a move, particularly to a city, it may be appropriate to use the former farm name as LNAB.