are used on the island of Ireland as well as elsewhere in the Western World as a result of the Irish diaspora. See also about Irish names
TREASA f Irish
Possibly means "strength" in Irish Gaelic. It is also sometimes used as an Irish form of THERESA
ULTÁN m Irish
Means "of Ulster" in Gaelic. Ulster is a region in the north of Ireland. This name was borne by two 7th-century Irish saints.
ÚNA f Irish
Possibly derived from Irish uan