| Language | Population | Bloc | Family | Cluster | Band | |
|---|---|---|---|---|---|---|
| ● Welsh | 1,373,660 | Indo-European | Celtic | Brythonic | ||
| ● Breton | 231,000 | Indo-European | Celtic | Brythonic | ||
| ● Irish | 139,960 | Indo-European | Celtic | Goidelic | ||
| ● Gaelic, Scottish | 61,800 | Indo-European | Celtic | Goidelic | ||
| ● Manx | 166 | Indo-European | Celtic | Goidelic |