The name Marni originates from several languages, incluing Hebrew, meaning "rejoice", and Latin as a variant of "Marina", meaning "of the sea". It also has derivations from Gaelic and Swahili. "Marni" and "Marnie" are the two most common spellings of the female first name, ranking 2446 and 1498, respectively, out of 4275 for females of all ages in the 1990 U.S. Census.