Old Irish cú

← Proto-Celtic *kū (inherited)

← Welsh ci (cognate)

← Proto-Indo-European *ḱwṓ (inherited)

← Primitive Irish ᚉᚒᚅᚐ (inherited)

→ Old English hund (cognate)

→ Irish cú (inherited)

→ Irish Conchúr (mention)

→ Scottish Gaelic cù (inherited)

→ Scottish Gaelic cuan (mention)

→ Manx coo (inherited)

→ Manx dooarchoo (mention)

→ Manx Conchoor (mention)

→ Middle Irish cú (inherited)

→ Old Irish Conchobar (compound)

→ Old Irish Cú Chulainn (mention)

→ Old Irish árchú (affix)

→ Old Irish conamail (suffix)

→ Old Irish doburchú (affix)

→ Old Irish cúán (suffix)

→ Old Irish Cú Bretan (mention)

→ Albanian samë (cognate)

→ Tocharian B ku (cognate)

→ Tocharian A ku (cognate)