We picked up one excellent word—a word worth traveling to New Orleans to get; a nice limber, expressive, handy word—'lagniappe.'
-- Mark Twain, Life on the Mississippi, 1883
"Lagniappe!" I screamed the word. The old Creole word they used in New Orleans when they want a little extra; a bonus of croissants, a few additional carrots dumped into the shopping bag, a baker's dozen, a larger portion of clams or crabs or shrimp.
-- Harlan Ellison, "On the Downhill Side," Deathbird Stories, 1975
Lagniappe, also spelled lagnappe, is an Americanism that entered English in the mid-19th century. It is thought to be a variant of the Spanish term la napa, which can be traced to the Quecha word yapa.