"Black friar, one of an order of mendicant preaching friars," 1630s, from Latin form of the name of Domingo de Guzman (Santo Domingo), who founded the order in Languedoc. They were confirmed by the pope in 1216. His name, like Italian form Dominic (q.v.), is from Latin dominicus,which in Christian use meant "devoted to the Lord."
masc. proper name, from Latin, from Octavius, from octavus "eighth," from octo (see eight).
But although we find so marked differences in the use of the numerals as names, it is impossible to believe that this use did not arise in the same way for all; that is, that they were at first used to distinguish children by the order of birth. But when we find them as praenomina in historical times it is evident that they no longer referred to order of birth. [George Davis Chase, "The Origin of Roman Praenomina," in Harvard Studies in Classical Philology, 1897]
The women's order, though sometimes persecuted, generally preserved its good reputation, but it quickly drew imposters who did not; nonetheless it eventually was condemned as heretical. A male order, called Beghards founded communities by the 1220s in imitation of them, but they soon degenerated (compare Old French beguin "(male) Beguin," also "hypocrite") and wandered begging in the guise of religion; they likely were the source of the words beg and beggar, though there is disagreement over whether Beghard produced Middle Dutch beggaert "mendicant" or was produced by it. The male order was condemned by the Church early 14c. and vanished by mid-16c.
Cole Porter's "Begin the Beguine" (1935) refers to a kind of popular dance of West Indian origin, from French colloquial béguin "an infatuation, boyfriend, girlfriend," earlier "child's bonnet," and before that "nun's headdress" (14c.), from Middle Dutch beggaert, ultimately the same word as the above. Compare English biggin "child's cap" (1520s), from the French word.
"native or inhabitant of the Dominican Republic," 1853, from the name of the republic, which became independent from Haiti in 1844; formerly it was Santo Domingo, the name of the capital and of the European colony established there in 1494, which was named for Santo Domingo de Guzmán, founder of the Order of the Dominicans, who established a presence there (see Dominican (1)).