| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | kukolo | kukoloj |
| Accusative | kukolon | kukolojn |
| Catalan | cucut |
|---|---|
| Czech | kukačka |
| Danish | gøg |
| Dutch | koekoek |
| English | cuckoo |
| Faeroese | geykur |
| Finnish | käki |
| French | coucou |
| German | Kuckuck |
| Greek | κούκος |
| Hungarian | kakukk |
| Icelandic | gaukur |
| Italian | cuculo; cucù |
| Latin | cuculus |
| Malay | kangkok |
| Norwegian | gauk; gjøk |
| Polish | kukułka |
| Portuguese | cuco |
| Romanian | cuc |
| Russian | кукушка |
| Saterland Frisian | Kuukuuk |
| Scottish Gaelic | cuthag |
| Spanish | cuclillo; cuco |
| Swedish | gök |
| Turkish | guguk |
| Welsh | cog |