The main aim of this research is to present Celtic languages on the British Isles and their connection to contemporary English. It is evident that the English language has gone through different changes over the time. It has been shaped by many new words, brought with new inhabitants from different areas. The changes enriched the English language. The enrichment of the English language influenced its huge expansion, making it the second most frequently spoken language in the world, with Mandarin in the first place. The English language could not be created by itself, in isolation. It was influenced by other languages in order to expand its existence. The Celtic influence on the English language can be seen mostly in place names when it come...