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1-526: Heylyn or Heilyn is a name of Brythonic origin meaning cup-bearer. Characters bearing the name occur in stories found in the Red Book of Hergest and other collections of Welsh history and legend. The Heylyn family came from Pentreheylin in the parish of Llandysilio Montgomeryshire. The family were hereditary cupbearers to the Princes of Powys, and a pedigree dates back to around 1000 AD. Grono ap Heylyn