Where does “árchú” come from?

árchú (Irish) comes from Old Irish árchú, from Old Irish cú, from Primitive Irish ᚉᚒᚅᚐ, from Proto-Celtic kū, from Proto-Indo-European ḱwṓ — dog.

árchú (Irish): fierce dog, ‘warhound’; war-dog, warrior

Definitions

  1. fierce dog, ‘warhound’; war-dog, warrior

Ancestry of “árchú”, step by step

StepLanguageWordMeaning
1Old Irishárchúwar-hound, slaughter-hound; watchdog
2Old Irishcúdog, hound; wolf
3Primitive Irishᚉᚒᚅᚐhound, wolf
4Proto-Celtickūdog; wolf
5Proto-Indo-Europeanḱwṓdog
Every word from Proto-Indo-European ḱwṓ →Every word from Proto-Celtic kū →Every word from Primitive Irish ᚉᚒᚅᚐ →