This is what we use when recommending standard forms for new names, which were not in the previous Gazetteer – so the rules have not changed at all.
Dyma a ddefnyddiwn wrth argymell ffurfiau safonol ar gyfer enwau newydd, nad oeddynt yn y Rhestr flaenorol – hynny ydi, nid yw’r rheolau wedi newid o gwbl.