Where does “jäniksenpoikanen” come from?

jäniksenpoikanen (Finnish) comes from Finnish poikanen, from Finnish -nen, from Finnish -inen, from Finnish -uus, from Proto-Finnic -uc — -ness, -hood.

Ancestry of “jäniksenpoikanen”, step by step

jäniksenpoikanen traces back through two separate lines of ancestry.

via Finnish poikanen

StepLanguageWordMeaning
1FinnishpoikanenDiminutive of poika; little boy; young
2Finnish-nenForms diminutives nouns or terms expressing...
3Finnish-inen-like, -ous, -y; -en; Creates adjectives from...
4Finnish-uusForms nouns from adjectives, expressing a quality
5Proto-Finnic-uc-ness, -hood

via Finnish jänis

StepLanguageWordMeaning
1Finnishjänishare; mountain hare, "Lepus timidus"; stowaway
2Proto-Finnicjänishare
Every word from Proto-Finnic -ucEvery word from Finnish -inenEvery word from Finnish -uus