cockatoo: [17] Cockatoo was originally a Malay word, although it has changed somewhat under the influence of English cock. It comes via Dutch kaketoe from Malay kakatua, a compound formed from kakak ‘elder brother or sister’ and tua ‘old’. A related word is cockatiel ‘small Australian parrot’ [19]; it comes ultimately from Portuguese cacatilha, formed from Malay kakatua with the Portuguese diminutive suffix -ilha, and it reached English via Dutch kaketielje.
