Name	Known for
Rhys ap Hywel Jason Jason See fewer	Parch (2015)
Nia Caron Anita Anita See fewer	Glanhafren IV, Episode 7 (1992)
Jeremi Cockram Sion Sion See fewer	Y Palmant Aur (1996)
Sera Cracroft Eileen Eileen See fewer	Pobol y Cwm (1974)
Arwyn Davies Mark Mark See fewer	Byw Celwydd (2016)
Helen Rosser Davies Sara Sara See fewer	Y Palmant Aur (1996)
Donna Edwards Britt Monk Britt Monk See fewer	Belonging (2000)
Carwyn Glyn DJ DJ See fewer	Svengali (2013)
Elin Harries Dani Dani See fewer	Pobol y Cwm (1974)
Mali Harries Jaclyn Parri Jaclyn Parri See fewer	Leap Year (2010)
Siw Hughes Kath Kath See fewer	Pobol y Cwm (1974)
Owain Huw Guto Parri Guto Parri See fewer	Masters of the Air (2024)
Gareth Jewell Dylan Dylan See fewer	Gwaith/Cartref (2011)
Volenté Lloyd Prisoner Prisoner See fewer	Billionaire Ransom (2016)
Richard Lynch Garry Garry See fewer	The Hollow Crown (2012)
Lois Meleri Jones Tesni Parri (as Lois Meleri-Jones) Tesni Parri (as Lois Meleri-Jones) See fewer	Hidden (2018)
Caryl Morgan Izzy Izzy See fewer	Coronation Street (1960)
Osian Morgan Aaron Aaron See fewer	Waterloo Road (2006)
Jonathan Nefydd Colin Colin See fewer	The Way (II) (2024)
Bethan Ellis Owen Ffion Ffion See fewer	Solomon & Gaenor (1999)
Lauren Phillips Kelly Kelly See fewer	Dance of the Dead (2008)
Aled Pugh Gerwyn Parri Gerwyn Parri See fewer	Stella (2012)
Jack Quick Rhys Rhys See fewer	Mabinogi-Ogi (2017)
Dyfan Rees Iolo Iolo See fewer	Pobol y Cwm (1974)
Mark Stuart Roberts Mathew Mathew See fewer	Pobol y Cwm (1974)
Sharon Roberts Gaynor Gaynor See fewer	The Bench (2001)
Andrew Teilo Hywel Hywel See fewer	Baker Boys (2011)
Aled Llyr Thomas Tyler Tyler See fewer	Mammoth (2021)
Emily Tucker Sioned Sioned See fewer	Pobol y Cwm (1974)