This diploma paper deals with toponyms, also referred to as place names, which can be found on the British Isles as evidence of different linguistic influences that shaped the English language. The aim of this paper is to give a brief overview of naming patterns and affixes that were used in the processes of naming. The toponyms are presented in five groups that are arranged in a chronological order as the settlements on the Isles occurred. Before the groups are discussed, a short overview of a theoretical part concerning toponymy is provided. The first group consists of Celtic settlers, followed by the Roman invasion, the conceiving of the Old English by the Anglo-Saxons, Viking raids and conquering, and the last group being the Normans. A short overview of the peoples’ settlement or colonization is given for every group, as well as place names and their influence on the English language. The last part of this paper consists of an overview of place names in Wales, Ireland and Scotland.