köken: From Middle High German wille, from Old High German willo, from Proto-West Germanic *willjō, from Proto-Germanic *wiljô (“desire, will”), from Proto-Indo-European *welh₁- (“to choose, wish”).
aile: um … willen, willen, willenlos, willens, willentlich, willig, Willkür
köken: Inherited from Latin arbitrium (“judgement, sentence”) (with a change of suffix from -io to -ío), from arbiter (“spectator, beholder”). Doublet of arbitrio.
perseverance, doggedness, stubbornness, grit, stamina, spunk, determination, courage, guts (unwavering strength to keep going when the going gets tough) · temper (tendency to be of a certain type of mood, especially of a bad or defiant one)
köken: From sisä- (“inner”) + -u. Originally referred to one's physical interior (compare sisus, sisusta), hence the meaning 'core; spirit' and thus 'courage, determination'. Compare Estonian sisu (“content”) and the development of English guts.
köken: From Old Galician-Portuguese voontade (13th century, Cantigas de Santa Maria), from the Latin voluntās, voluntātis (“will; desire; disposition toward”). Cognate with Portuguese vontade and Spanish voluntad.
Etimoloji
By surface analysis, 意志(いし) (ishi) + 力(りょく) (-ryoku).