köken: Inherited from Old East Slavic къи (kŷi), from Proto-Slavic *kъjь (“who, what, which”), from *kъ (“who”) + *-jь, from Proto-Balto-Slavic *kas (“who”), from Proto-Indo-European *kʷos (“who”).
köken: Inherited from Middle Persian 𐭪𐭲𐭠𐭬 (ktʾm /kadām/), Manichaean Middle Persian 𐫐𐫅𐫀𐫖 (kdʾm), Northern Luri کوم (kom), from Proto-Indo-European *kʷi-, *kʷo-. See there for cognates.
köken: Etymology tree Proto-Indo-European *kʷ- Proto-Indo-European *kʷos Proto-Indo-European *-teros Proto-Indo-European *kʷóteros Proto-Balto-Slavic *kateras Proto-Slavic *koterъ Proto-Slavic *kotorъ Old Polish który Polish który Inherited from Old Polish który.
who, which, that (referring to the previous word or phrase; see usage notes)
köken: From Proto-Finnic *joka (compare Karelian joka, Votic jõka), from Proto-Finno-Permic *jo (compare Northern Sami juohkẹ, juogọ, Erzya ю- (ju-) in юза-тоза (juza-toza, “back and forth”), Eastern Mari южо (južo, “some”), Western Mari юж (juž, “some”)). The nominative and genitive singular forms, which would have otherwise been monosyllabic, have been extended with -ka (as with kuka and mikä).
Mitä maailma valitsee? — Dünya hangisini seçecek?
Jos putoaa jäihin, kannattaa palata samaa reittiä, jota pitkin oli tullutkin.
Hän säveltää harrastuksenaan musiikkia, jossa hän onkin taitava.
of what kind, sort, description, nature; what kind of · of such kind as, one such as, just as, as, like · of a particular kind
köken: Derived from Proto-Indo-European *kʷo- (“interrogative, relative stem”) and maybe *h₂el- (“to grow”) (cf. the sense of indolēs, from this root). Cognate with Ancient Greek πηλίκος (pēlíkos).