Where does “yre” come from?

yre (Middle English) comes from Middle English iren, from Old English īsern, from Proto-West Germanic īsarn, from Proto-Germanic īsarną, from Proto-Celtic īsarnom, from Proto-Indo-European h₁ésh₂r̥ — blood.

Ancestry of “yre”, step by step

StepLanguageWordMeaning
1Middle Englishirencoiron
2Old Englishīserniron
3Proto-West Germanicīsarniron
4Proto-Germanicīsarnąiron
5Proto-Celticīsarnomiron
6Proto-Indo-Europeanh₁ésh₂r̥blood
Every word from Proto-Indo-European h₁ésh₂r̥ →Every word from Proto-Celtic īsarnom →Every word from Proto-Germanic īsarną →