Etymology
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Ira 
masc. proper name, from Hebrew, literally "watchful," from stem of 'ur "to awake, to rouse oneself."
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I.R.A. (1)
also IRA, 1921, initialism (acronym) for Irish Republican Army, the full name of which attested from 1919.
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Iran 
country name, from Persian Iran, from Middle Persian Ērān "(land) of the Iranians," genitive plural of ēr- "an Iranian," from Old Iranian *arya- (Old Persian ariya-, Avestan airya-) "Iranian", from Indo-Iranian *arya- or *ārya-, a self-designation, perhaps meaning "compatriot" (see Aryan).

In English it began to be used 1760s, by orientalists and linguists (Alexander Dow, William Jones), in historical contexts, and usually with a footnote identifying it with modern Persia; as recently as 1903 "Century Dictionary" defined it as "the ancient name of the region lying between Kurdistan and India." In 1935 the government of Reza Shah Pahlavi requested governments with which it had diplomatic relations to call his country Iran, after the indigenous name, rather than the Greek-derived Persia.
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Iraq 
country name, 1920, from an Arabic name attested since 6c. for the region known in Greek as Mesopotamia; often said to be from Arabic `araqa, covering notions such as "perspiring, deeply rooted, well-watered," which may reflect the desert Arabs' impression of the lush river-land. But the name might be from, or influenced by, Sumerian Uruk (Biblical Erech), anciently a prominent city in what is now southern Iraq (from Sumerian uru "city"). Related: Iraqi (attested in English from 1777, in reference to regional Mesopotamian music or dialects).
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Irene 

fem. proper name, from French Irène, from Latin Irene, from Greek Eirēnē, literally "peace, time of peace," a word of unknown etymology.

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Irian 
Indonesian name for New Guinea, said to mean literally "cloud-covered."
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Irma 
fem. proper name; see Emma.
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IRS 
also I.R.S., initialism (acronym) of Internal Revenue Service, U.S. federal government tax collection agency, attested by 1954. The office dates to 1862; name changed 1953 from Bureau of Internal Revenue.
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Irwin 
masc. proper name, Old English Eoforwine "boar-friend;" often confused with Irving, Irvin, which are from Irvine, Ayrshire, or Irving, Dumfries.
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Isaac 
masc. proper name, name of a biblical patriarch, from Late Latin, from Greek Isaak, from Hebrew Yitzhaq, literally "he laughs," imperf. of tzahaq "he laughed."
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