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.^[1]

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.^[2] Grono ap Heylyn was commissioned by Llewelyn the Last in peace negotiations with Edward I of England. ^[3]

Heylyn or Heylin as a surname may refer to:

• Edward Heylyn (1695–1765), English merchant and entrepreneur, one of the founders of the Bow porcelain factory
• John Heylyn (1685–1759), Anglican divine, known as the Mystic Doctor
• Peter Heylin (1599–1662), English ecclesiastic and author of polemical, historical, political and theological tracts
• Rowland Heylyn (1563-1631) London merchant and publisher of a Welsh bible

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