Etymology
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Eire 
ultimately from Old Irish Eriu (accusative Eirinn, Erinn). The reconstructed ancestry of this derives it from Old Celtic *Iveriu (accusative *Iverionem, ablative *Iverione), perhaps (Watkins) from PIE *pi-wer- "fertile," literally "fat," from root *peie- "to be fat, swell" (see fat (adj.)).
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eirenic (adj.)

"tending toward or productive of peace," 1866, from Greek eirēnikos, from eirēnē "peace, time of peace," a word of unknown etymology. Earlier as irenic (1864), irenical (1650s).

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