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Welsh coch
Proto-Brythonic *kox (inherited)
Ancient Greek κόκκος (derived)
Cornish kogh (cognate)
Latin coccum (derived)
Middle Welsh coch (inherited)

English torgoch (mention)
English Gough (mention)
Welsh Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch (mention)
Welsh cochen (affix)
Welsh cochyn (affix)
Welsh melyngoch (compound)
Welsh glasgoch (affix)
Welsh Goch (mention)
Welsh buwch goch gota (affix)
Welsh rhytgoch (compound)
Welsh cochlas (affix)
Welsh picwns coch (compound)
Welsh sos coch (compound)
Welsh cochwys (compound)
Cornish kogh (cognate)