Where does “Luzoninsalmi” come from?

Luzoninsalmi (Finnish) comes from Finnish Salmi, from Finnish -lä, from Finnish -as, from Proto-Finnic -s, from Proto-Finno-Ugric -s.

Ancestry of “Luzoninsalmi”, step by step

Luzoninsalmi traces back through two separate lines of ancestry.

via Finnish Salmi

StepLanguageWordMeaning
1FinnishSalmiA town in Russian Karelia
2Finnish-läFront vowel variant of -la
3Finnish-asForms some adjectives; Forms some nouns
4Proto-Finnic-sForms nouns
5Proto-Finno-Ugric-s

via Finnish Luzon

StepLanguageWordMeaning
1FinnishLuzon
2SpanishLuzón
3Tagaloglusongdescent to a lower place
Every word from Proto-Finno-Ugric -sEvery word from Finnish -läEvery word from Finnish -as