Irish county, from Irish Tir Eoghain "Eoghan's Land," from Eoghan "Owen," ancestor of the O'Neills, who owned land here. Tir also forms the final syllable in Leinster, Munster, Ulster.
Entries linking to tyrone
Ulster
northernmost of the four provinces of Ireland, 14c., from Anglo-French Ulvestre (early 13c.), Anglo-Latin Ulvestera (c. 1200), corresponding to Old Norse Ulfastir, probably from Irish Ulaidh "men of Ulster" + suffix also found in Leinster, Munster, and perhaps representing Irish tir "land."
Tyrol
German Tirol, ultimately from Celtic tir "land" (see Tyrone). Related: Tyrolean.