Where does “itsekkäisyys” come from?

itsekkäisyys (Finnish) comes from Finnish itsekkäinen, from Finnish itsekäs, from Finnish itse, from Proto-Finnic icek, from Hebrew יצחק — to laugh.

Ancestry of “itsekkäisyys”, step by step

StepLanguageWordMeaning
1Finnishitsekkäinen
2Finnishitsekässelfish
3Finnishitseoneself; used to emphasize the person of the head...
4Proto-Finnicicekself
5Hebrewיצחקto laugh
Every word from Hebrew יצחקEvery word from Proto-Finnic icekEvery word from Finnish itse
itsekkäisyys — Etymology, Origin & Word History | Etymology Explorer