Welsh placename

The placenames of Wales derive in most cases from the Welsh language, but have also been influenced by linguistic contact with the Romans, Anglo-Saxons, Vikings, Anglo-Normans and modern English. The study of placenames (or toponymy) in Wales reveals significant features of the country's history and geography as well of the development of the Welsh language.

During the 4th to 11th centuries, while Anglo-Saxons and other migrants from Europe settled adjoining areas of Britain, Wales developed as a distinctive entity, developing its language, culture, legal code, and political structures. By stages between the 11th and 16th centuries, Wales was then subdued, conquered and eventually incorporated into the Kingdom of England while still retaining many distinct cultural features, most notably its language. Since then, there has been a mixing of cultures in Wales, with the English language dominant in industry and commerce, but with Welsh remaining as a living language, particularly in its stronghold, y Fro Gymraeg or "Welsh language country" in northwest, mid- and west Wales. Welsh culture and political autonomy has been reasserted increasingly since the mid 19th century.

The Welsh language is a Western Brittonic language descended from the Common Brittonic spoken throughout Britain in the centuries before the Anglo-Saxon and Viking invasions that led to the creation of England. Many place names in Britain, particularly of natural features such as rivers and hills, derive directly from Common Brittonic. Obvious examples of place names of Welsh origin are the numerous , from the Welsh afon ("river") and place names such as Penrith.

Place names from the Western Brittonic-speaking Hen Ogledd occur in Cumbria and the Scottish Lowlands. These include the name of Edinburgh, from Cumbric Din Eidin "Eidin's Fort".

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