Where does “kaukasiansupiainen” come from?

kaukasiansupiainen (Finnish) comes from Finnish supiainen, from Finnish -iäinen, from Finnish -inen, from Finnish -uus, from Proto-Finnic -uc — -ness, -hood.

kaukasiansupiainen (Finnish): Güldenstädt's shrew, Crocidura gueldenstaedtii

Definitions

Güldenstädt's shrew, Crocidura gueldenstaedtii

Ancestry of “kaukasiansupiainen”, step by step

kaukasiansupiainen traces back through two separate lines of ancestry.

via Finnish supiainen

Step	Language	Word	Meaning
1	Finnish	supiainen	white-toothed shrew shrew of the genus
2	Finnish	-iäinen	Front vowel variant of -iainen
3	Finnish	-inen	-like, -ous, -y; -en; Creates adjectives from...
4	Finnish	-uus	Forms nouns from adjectives, expressing a quality
5	Proto-Finnic	-uc	-ness, -hood

via Finnish Kaukasia

Step	Language	Word	Meaning
1	Finnish	Kaukasia	Caucasia
2	Russian	Кавказия	—

Every word from Proto-Finnic -uc →Every word from Finnish -inen →Every word from Finnish -uus →