An Irish island or place name, possibly used in some older texts to refer to a location or person from that area.
From Irish Achill, a place name of uncertain etymology. It appears in some English texts, particularly those discussing Irish geography or people, though usage as a common noun is rare.
Irish place names often preserve ancient languages that predate even modern Irish, and Achill's true meaning may have been lost when the English language arrived and started recording Irish geography phonetically.
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