Proto-Celtic *artos

→ English Arthur (derived)

→ Breton arzh (inherited)

→ Proto-Brythonic Artognou (derived)

→ Welsh arth (inherited)

→ Basque hartz (derived)

→ Faroese Artur (derived)

→ Italian Arturo (derived)

→ Cornish arth (inherited)

→ Noric 𐌀𐌓𐌕𐌄𐌁𐌖𐌈𐌆 (derived)

→ Old Irish art (inherited)