There are two main official languages spoken in Hawaii which are recognized by the constitution: English and Hawaiian.
Of the Austronesian language family a branch is known as the Polynesian branch.
Hawaiian is a part of this branch.
It began development around 1000 AD.
Originally foreigners, the Polynesians have lived in these islands for very long and thus have come to be known as the Hawaiian people.
And thus their language too came to be known as Hawaiian.
Before Captain Cook came to the islands, Hawaiian language had no script, so it could not be written.
The written form was developed by the American Missionaries around 1820-1826.
What they did was, assign Latin characters to the Hawaiian sounds and thus, Hawaiian could now be written.
A number of residents of Hawaii speak in something known as Hawaii Creole English or HCE.
It is often referred to as 'Pidgin'.
Its lexicon is derived from English and also a number of Hawaiian, Portuguese, Japanese and Filipino words.
The immigration rate had greatly increased from countries like China, Spain, Japan and Portugal, by the 19th century and Pidgin English was developed.
By the 20th century this became Creole English because the pidgin speakers had children who picked up pidgin as a native language.
Without considering them archaic, a number of Hawaiian words are used in HCE.
The names of most places and animals are retained as they were in Hawaiian.
HCE is a lot like English but for a few differences here and there.
Like in HCE, all elders, known or unknown are referred to as 'uncle' and 'auntie' irrespective of the fact that they are related to you or not.
In the colloquial HCE, a number of words are dropped in case the meaning of the sentence is implicit.
You may wish to know more at: Travel to Hawaii and Travel to Kauai