'arizonan' originates from English formation using the place-name 'Arizona' + the demonym suffix '-an' to mean 'person from Arizona'.

'Arizona' as a place-name entered English from Spanish 'Arizona', which likely came from a native source; the demonym 'Arizona' + '-an' formed the English word 'arizonan'.

Initially it denoted someone from the place named 'Arizona'; the meaning has remained 'a person from Arizona' in modern usage.