Welsh arth

← Proto-Brythonic *arθ (inherited)

← Proto-Celtic *artos (inherited)

← Proto-Indo-European *h₂ŕ̥tḱos (inherited)

→ English Arthur (derived)

→ Welsh arthes (affix)

→ Welsh cyfarth (affix)

→ Welsh arthan (compound)

→ Welsh Arth Fawr (compound)

→ Welsh Arth Fwyaf (compound)

→ Welsh Arth Fach (compound)

→ Persian خرس (cognate)

→ Judeo-Tat хуьрс (cognate)

→ Noric 𐌀𐌓𐌕𐌄𐌁𐌖𐌈𐌆 (cognate)

→ Old Irish art (cognate)