Where does “Keski-Vuosaari” come from?

Keski-Vuosaari (Finnish) comes from Finnish Vuosaari, from Finnish sääri, from Finnish -lä, from Finnish -as, from Proto-Finnic -s, from Proto-Finno-Ugric -s.

Ancestry of “Keski-Vuosaari”, step by step

Step	Language	Word	Meaning
1	Finnish	Vuosaari	—
2	Finnish	sääri	shank, shin; cannon; used to refer to legs from...
3	Finnish	-lä	Front vowel variant of -la
4	Finnish	-as	Forms some adjectives; Forms some nouns
5	Proto-Finnic	-s	Forms nouns
6	Proto-Finno-Ugric	-s	—

Every word from Proto-Finno-Ugric -s →Every word from Finnish -lä →Every word from Finnish sääri →