The Celtic languages form a branch of the Indo-European (IE) language family. They derive from Proto-Celtic and are divided into Continental Celtic languages (Lepontic, Gaulish, Galatian, Noric, Celtiberian, Gallaecian) and Insular Celtic languages (six living languages: Breton, Irish, Scottish, Gaelic and Welsh; two revived languages: Cornish, Manx).
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/2019/a-linguistical-analysis-of-ancient-celtic-language/.