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Finnish

From Proto-Finnic *ku (from Proto-Uralic *ku- ~ *ko-) + -ka.

  • Cognates with Estonian kumb (which), Hungarian hol (where), Forest Enets hōke (which one), Nganasan kuninu (where), and Kamassian kāmǝ̑n (if).
  • Compare Proto-Indo-European *kʷi- ~ *kʷe- ~ *kʷo-, whence the English interrogatives English what, where, who, how derive.

Hungarian

Origin uncertain; perhaps an Italian loan word, compare Northern Italian cuco (goofy).

Serbo-Croatian

From Proto-Slavic *kuka (hook, hook-shaped). Akin to kȕk.