OS reports being increasingly dependent on recording names that are written on public and other signage or names that are recorded by relevant authorities.
Dywed OS eu bod yn gynyddol ddibynnol ar gofnodi enwau sydd wedi'u hysgrifennu ar arwyddion cyhoeddus ac arwyddion eraill, neu enwau sy'n cael eu cofnodi gan awdurdodau perthnasol.