via Wikipedia infobox
Insular Celtic languages are the group of Celtic languages spoken in Brittany, Great Britain, Ireland, and the Isle of Man. All surviving Celtic languages are in the Insular group, including Breton, which is spoken on continental Europe in Brittany, France. The Continental Celtic languages, although once widely spoken in mainland Europe and in Anatolia, are extinct. Pritenic language, an ancestor of Pictish, was proposed as a part of Insular Celtic or a branch inside Early Brittonic.
Six Insular Celtic languages are extant (in all cases written and spoken) in two distinct groups:
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).