However, the number of people reporting to be able to speak Welsh has declined each quarter from December 2018 to March 2020, before increasing slightly in the most recent quarter.
Fodd bynnag, mae nifer y bobl sy'n adrodd eu bod yn gallu siarad Cymraeg wedi gostwng bob chwarter rhwng mis Rhagfyr 2018 a mis Mawrth 2020, cyn cynyddu ychydig yn y chwarter diweddaraf.