A variant of Melanie, from Greek melania meaning 'blackness' or 'dark.'
Melanni is a distinctive variant of Melanie, a name with roots reaching back to ancient Greece and the Latin "Melania," derived from the Greek "melaina," meaning black or dark. Far from carrying any negative connotation in its original context, this darkness was associated with the rich, fertile earth and the deep mystery of the night — the Greek word for honey, "meli," shares similar root relationships, and the broader Mela- family of words evoked depth and richness rather than absence. The name was borne by two notable early Christian saints: Melania the Elder and her granddaughter Melania the Younger, both wealthy Roman noblewomen who renounced their considerable fortunes to live in religious poverty and contemplation in the fifth century CE.
Their stories inspired wide devotion and spread the name through the medieval Christian world. Melanie surged in popularity across the Anglophone world in the mid-twentieth century, partly propelled by Margaret Mitchell's 1936 novel Gone with the Wind and the enormously successful 1939 film adaptation, in which Melanie Hamilton Wilkes — gentle, selfless, and morally luminous — became one of American popular culture's most beloved literary figures. The character's association with feminine virtue and quiet strength gave the name a warm, romantic glow that persisted through the postwar decades and into the 1970s and 1980s, when it ranked among America's most popular girls' names.
Melanni, with its doubled final consonant, represents the kind of individualized orthographic variant that became popular as the twentieth century closed — parents seeking to preserve the phonetics of a beloved name while creating something visually distinct. The spelling subtly changes the name's rhythm, lending it a slightly more elaborate, continental feel, as if borrowed from Italian or Spanish naming traditions where such doubled endings appear naturally. Bearers of this spelling carry the full cultural inheritance of Melanie while wearing it as something personally their own.