Today, there are two Celtic language groups: Brythonic (P-Celtic) which includes Welsh, Breton, and Cornish (extinct); and Goidelic (Q-Celtic) which includes Irish, Scottish Gaelic, and Manx (extinct).
While the last native speaker of Cornish died in 1676, in the twentieth century there has been a renewed interest in the language and, as a result, there are about 3,500 Cornish second-language speakers today.