Etymology

Anglesey

An·gle·sey
A1N1G2L1E1S1E1Y4

Today it means: An island and traditional county at the northwestern extremity of north Wales. It is separated from Caernarfonshire on the mainland by a narrow stretch of water called the Menai Strait. The county was merged into Gwynedd in 1974. Full definition →

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The story

Possibly of Old Norse origin, from Ǫngullsey (“hook island”) (ǫngull + ey) or Ǫnglisey (“Ǫngli's island”), the name Ǫngli itself being a variant of Ǫngull and from the former noun. Folk etymology confused the name with that of the Angles. More at Anglesey.

Etymology from Wiktionary, CC BY-SA 4.0.