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In page Hokkaido:

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During the Nara and Heian periods (710–1185), people in Hokkaidō conducted trade with Dewa Province, an outpost of the Japanese central government. From the feudal period, the people in Hokkaidō began to be called Ezo. Hokkaidō subsequently became known as Ezochi (蝦夷地, lit. "Ezo-land")[3] or Ezogashima (蝦夷ヶ島, lit. "Island of the Ezo"). The Ezo mainly relied upon hunting and fishing and obtained rice and iron through trade with the Japanese.[citation needed]