Old English deorc

← Proto-West Germanic *derk (inherited)

→ English dark (inherited)

→ Old English deorcnes (affix)

→ Old English deorcian (suffix)

→ Middle English derk (inherited)

→ Irish dearg (cognate)

→ Scottish Gaelic dearg (cognate)

→ Old Irish derg (cognate)

→ Tocharian B tarkär (cognate)

→ Tocharian A tärkär (cognate)

→ Yola dhourk (inherited)