I realise this is only a bone of contention for some people, especially with certain anglicised spellings of Welsh names such as Llanelly, Conway and Aberystwith, to name a couple.
I thought I'd post a couple of the "better" transcriptions of place names I've come across in census' up to now.
Rhiwgyfyldie - Dwygyfylchi
Chernys Null - Llandysul
Pimsaint - Llanpumsaint
Anyone else some across any others?