Siôn or Sion ([ʃoːn]) is a Welsh form of the given name John, pronounced in English identically to the Irish name Seán. Notable people with the name include:
Surname:
Eleri Siôn (born 1971), Welsh radio and television presenter
Llywelyn Siôn (1540–c. 1615), Welsh-language poet
Sawnder Sion (16th century), Welsh poet
Given name:
Siôn ap Hywel (fl. c. 1490–1532), Welsh-language poet
Sion Bebb (born 1968), Welsh golfer
Sion Blythe (1781–1835), American pastor
Sion Record Bostick (1819–1902), American soldier
Siôn Bradford (1706–1785), Welsh-language poet
Sion Brinn (born 1973), Jamaican swimmer and coach
Siôn Cent (c. 1400–1435/40), Welsh-language poet
Siôn Ceri (fl. early 16th century), Welsh-language poet
Siôn Corn, Welsh name of Father Christmas
Sion Jones (born 1979), Welsh cyclist
Sion Russell Jones (born 1986), Welsh singer and songwriter
Sion Morris (born 1977), Welsh cricketer
Siôn Aled Owen, Welsh politician from Wrexham
Siôn Phylip (1543–1620), Welsh-language poet
Sion Hart Rogers (1825–1874), American politician from North Carolina
Siôn Simon (born 1968), British politician from Birmingham Erdington
Sion Sono (born 1961), Japanese filmmaker and poet
Siôn Treredyn or John Edwards (c. 1605–1656), Welsh priest and translator
Siôn Tudur or John Tudur (c. 1522–1602), Welsh-language poet
Twm Siôn Cati or Welsh Wizard, Welsh figure in folklore
Fictional characters:
Sion Eltnam Atlasia, a character in the dōjin soft fighter series Melty Blood
Darth Sion, a character in the video game Star Wars: Knights of the Old Republic II: The Sith Lords
Sion the Undead Champion, a playable champion in the game League of Legends
