'aragonian' originates from English, ultimately derived from the place name 'Aragon' (Spanish 'Aragón'), itself from medieval Latin 'Aragonia' referring to the region around the Aragón river.

'aragonian' was formed in English by adding the adjectival/demonymic suffix '-ian' to the place name 'Aragon' (from medieval Latin 'Aragonia'), producing the adjective or noun meaning 'of or from Aragon'.

Initially the root referred only to the place name 'Aragon'; over time the derived form 'aragonian' has come to mean both 'relating to Aragon' and 'a person from Aragon' in English.