Place:Llanddwywe Uwch Y Graig, Merionethshire, Wales

source: Family History Library Catalog

Llanddwywe Uwch Y Graig and Llanddwywe Is Y Graig were two townships converted into civil parishes in 1894. They were located at the north of Dolgellau Rural District. Llanddwywe Is Y Graig had a short sea coast, and Llanddwywe Uwch Y Graig was inland and somewhat north of Llanddwywe Is Y Graig. The word uwch in the first township means "higher". Each covers a large area.

Neither Wikipedia or A Vision of Britain through Time are very informative regarding these townships. There is an article on the settlement of Llanddwywe which may be more helpful.

Research Tips

• A 1900 Ordnance Survey map of the historic county of Merionethshire is available on the A Vision of Britain through Time website. This shows all the old parishes within their urban and rural districts. Large farms and estates are also marked.
• Some words in Welsh come up time and time again and you may want to know what they mean or how to pronounce them. For example,
  "Eglwys" is a church and the prefix "Llan" is a parish.
  "w" and "y" are used as vowels in Welsh.
  "Ll" is pronounced either "cl" or "hl" or somewhere in between. "dd" sounds like "th".
  The single letter "Y" is "the" and "Yn" means "in".
  "uwch" means "above"; "isod" is "below" or "under";
  "gwch" is "great", "ychydig" is "little";
  "cwm" is a "valley".

In both Welsh and English all these words are commonly used in place names in the UK. Place names are often hyphenated, or two words are combined into one. Entering your problem phrase into Google Search, including the term "meaning in Welsh", will lead you to Google's quick translation guide. I'm no authority; these are just things I have picked up while building up this gazetteer for WeRelate.