However, Cardiff saw an increase (around 1,300) in the number of people aged 3 to 15 years reported as being able to speak Welsh between 2011 and 2021.
Fodd bynnag, yng Nghaerdydd gwelwyd cynnydd (tua 1,300) yn nifer y bobl 3 i 15 oed y nodwyd eu bod yn gallu siarad Cymraeg rhwng 2011 a 2021.