The Celts spoke various Celtic languages, which are divided into different branches: Continental Celtic and Insular Celtic. Examples of Insular Celtic languages include Irish, Scottish Gaelic, Welsh, and Breton. The specific Celtic language spoken would depend on the region and time period.
The Celtic languages are part of a group called the Italo-Celtic branch of the Indo-European family of languages, which arose somewhere in Eastern Europe.
There's actually no such language as "Celtic". Celtic refers to a group of dozens of languages, six of which are spoken today:BretonCornishIrish GaelicManxScottish GaelicWelsh
The modern Celtic languages are:IrishScottish GaelicManxWelshBretonCornishand various extinct languages: Gaulish, Celtiberian, Lepontic, Galatian, etc.
Celtic languages were spoken by Celtic peoples in Western and Central Europe, including languages like Irish, Scottish Gaelic, Welsh, and Breton. Germanic languages were spoken by Germanic peoples in Northern Europe, including languages like German, English, Dutch, Swedish, and Danish. Both language groups have influenced each other over time due to historical interactions.
There are/were several Celtic languages: Irish, Scottish, Welsh and Breton being the principal ones that are still spoken. The last living speaker of Manx, the Celtic language spoken by the people of the Isle of Man, died a few years ago.
Celtic languages originated in Central Europe, specifically around the headwaters of the Danube River. They spread across Europe through migrations and interactions with neighboring peoples. Today, Celtic languages are mainly spoken in Ireland, Scotland, Wales, Cornwall, Brittany, and the Isle of Man.
There are various Celtic languages: Breton (Brittany), Welsh, Irish, Scottish Gaelic, Cornish, Manx (Isle of Man). They derived from Indo-European via Proto-Celtic, which once spread across much of Europe (cf Gallic, in Gaul) but was gradually pushed to the western extremities, fragmenting into the various forms indicated above.
The Germanic, Romance, Celtic, and Slavic languages are all branches of the Indo-European language family. Germanic languages are spoken in Northern Europe, Romance languages in Southern Europe, Celtic languages in Western Europe, and Slavic languages in Eastern Europe.
Celtic refers to a group of dozens of languages, six of which are spoken today:BretonCornishIrish GaelicManx GaelicScottish GaelicWelsh
The Celtic language spoken of the Isle of Man was Manx, which some societies are currently trying to bring back as a spoken language.
Welsh is the most commonly spoken Celtic language, about 90% of the speakers live in Wales and England. Irish is the second commonly spoken.