Knickerbocker

[nik-er-bok-er] /ˈnɪk ərˌbɒk ər/
noun
1.
a descendant of the Dutch settlers of New York.
2.
any New Yorker.
Origin
1800-10, Americanism; generalized from Diedrich Knickerbocker, fictitious author of Washington Irving's History of New York
British Dictionary definitions for Knickerbocker

Knickerbocker

/ˈnɪkəˌbɒkə/
noun (US)
1.
a descendant of the original Dutch settlers of New York
2.
an inhabitant of New York
Word Origin
C19: named after Diedrich Knickerbocker, fictitious Dutchman alleged to be the author of Washington Irving's History of New York (1809)
Word Origin and History for Knickerbocker

"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."