Brython

[brith-uh n, -on] /ˈbrɪθ ən, -ɒn/
noun
1.
a member of the Brythonic-speaking Celts.
2.
a Briton.
Origin
1880-85; < Welsh; see Briton
British Dictionary definitions for Brython

Brython

/ˈbrɪθən/
noun
1.
a Celt who speaks a Brythonic language Compare Goidel
Word Origin
C19: from Welsh; see Briton