Where does “Länsi-Suomi” come from?

Länsi-Suomi (Finnish) comes from Finnish länsi, from Proto-Finnic länci, from Proto-Finnic lanci — lowland.

Länsi-Suomi (Finnish): those parts of Southern Finland in which the so called western dialects are spoken (see map)

Definitions

  1. those parts of Southern Finland in which the so called western dialects are spoken (see map)

Ancestry of “Länsi-Suomi”, step by step

Länsi-Suomi traces back through two separate lines of ancestry.

via Finnish länsi

StepLanguageWordMeaning
1Finnishlänsiwest; the West
2Proto-Finniclänciwest
3Proto-Finniclancilowland

via Finnish suomi

StepLanguageWordMeaning
1FinnishsuomiThe Finnish language; Third-person singular...
2Proto-Finnicsoomiperson from Southwest Finland
Every word from Proto-Finnic lanci →Every word from Proto-Finnic länci →Every word from Finnish länsi →