A modern elaborated spelling of Adelina, keeping the same noble meaning from the Germanic adal root.
Adelinne is a graceful variant of Adeline, a name with deep Germanic and Frankish roots that has been carried by queens, saints, and literary heroines for over a thousand years. Its core element is the Old High German adal, meaning 'noble' or 'of noble kind' — the same root that gives us Adele, Adelaide, and Adalheid (from which the Australian city Adelaide ultimately takes its name). The -ine suffix is a French and Latin diminutive of affection, so Adeline in its original sense means 'little noble one' — a name simultaneously grand and tender, which accounts for much of its enduring appeal.
Among its most distinguished historical bearers is Saint Adeline of Normandy, an 11th-century abbess who founded the monastery of Saint-Sauveur-d'Évreux, and Adeline of Louvain, second wife of Henry I of England. The Romantic era claimed the name enthusiastically — Edgar Allan Poe's poem 'For Annie' and various Victorian parlor songs kept it alive in the anglophone world, and the name reached perhaps its most famous musical incarnation in the barbershop standard 'Sweet Adeline' (1903), sung by doting fathers and harmonizing quartets alike for generations. The doubled -nn- in Adelinne is a deliberate refinement, common in French and Belgian naming practice, that gives the name a slightly more formal, continental orthography.
It signals the same pronunciation as Adeline while visually distinguishing the child's name as something considered and precise. In the 21st century, as Adeline has returned to the upper tiers of baby name charts, Adelinne offers families a way to honor the beloved name's history while giving their daughter a spelling that is unmistakably her own.