Other possibilities include a common origin with Purmoniemi, a peninsula in Evijärvi and Purmonsaari, a hill in Lappajärvi; as well as a relation to the South Ostrobothnian dialectal word purmu referring to a pit for storing beets during the winter.
Alternative explanations may stem from a common root with Purmoniemi, a landmass in Evijärvi, or a link to the South Ostrobothnian word purmu, denoting a storage hole for beets during the cold months.