U.S. capital, founded 1791, named for President George Washington (1732-1799); the family name is from a town in northeastern England, from Old English, literally "estate of a man named Wassa." The U.S. state was named when it was formed as a territory in 1853 (admitted to the union 1889). Related: Washingtonian.

ancient Greek settlement in Thrace on the European side of the Bosphorus, said to be named for its 7c. B.C.E. founder, Byzas of Megara. A place of little consequence until 330 C.E., when Constantine the Great re-founded it and made it his capital (see Constantinople).

city in Bithynia, opposite Constantinople, site of an important Church council (451),  from Phoenician, literally "new town." 

New York City borough, named for Catherine of Braganza, queen of English King Charles II.

Persian Gulf country, named for its capital city (said to have been founded in current form 1705), which is from Arabic al-kuwayt, diminutive of kut, a word used in southern Iraq and eastern Arabia for a fortress-like house surrounded by a settlement and protected by encircling water, and said to be ultimately from Persian. Related: Kuwaiti.

ancient capital of Persia, founded 6c. B.C.E. by Darius the Great; from Greek, literally "city of the Persians," from Perses "Persians" (see Persian) + -polis "city" (see polis). The modern Iranian name for the place is Takht-e-jamshid, literally "throne of Jamshid," a legendary king whose name was substituted when Darius was forgotten. Related: Persepolitan.

city in northwest Thailand, founded in 1292; the name is Thai northern dialect chiang "town" + mai "new."

1791, from name of Emanuel Svedberg, Swedish mystic and religious philosopher (1668-1772). His followers organized 1788 as The New Church.

"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)).

"descendant of Dutch settlers of New York," 1831, from Diedrich Knickerbocker, the name under which Washington Irving published his popular "History of New York" (1809). The pen-name was borrowed from Irving's friend Herman Knickerbocker, and literally means "toy marble-baker," from German knicker, schoolboy slang for "marble," apparently an agent-noun from the imitative verb knikken "to snap."