Rosse is likely a surname-style name related to Ross, originally linked to a headland or promontory.
Rosse is a name with several distinct possible heritages, each lending it a different texture of meaning. As a variant of Rose, it traces back to the Latin 'rosa' — a name that traveled from antiquity through medieval Marian devotion (the rose was a symbol of the Virgin Mary and of divine love) into the heart of the English Romantic tradition. The Victorians elevated Rose to near-ubiquity, and its various elaborations — Rosalie, Rosalind, Rosamund, Rosalyn — colonized naming culture for generations.
Rosse strips this heritage down to something stark and strong, losing the softness of the final 'e' sound and gaining a kind of Nordic or Scottish sharpness. In its Scottish and Gaelic dimension, Ross (and by extension Rosse) derives from the Gaelic 'ros,' meaning 'headland' or 'promontory' — the tongue of land that juts into the sea. It names one of Scotland's most dramatic landscapes, Ross-shire in the northwest Highlands, and has been borne by scholars, explorers, and soldiers.
The Arctic explorer Sir James Clark Ross, who charted both polar regions in the nineteenth century and gave his name to the Ross Sea, is among the most celebrated bearers. This geographical and exploratory lineage gives the name an adventurous, windswept quality quite distinct from the floral Rose. As a given name today, Rosse sits in an appealing space between the familiar and the unusual. It sounds immediately recognizable while being genuinely uncommon in registers — a name that sparks a moment of pleasant uncertainty in the listener before resolving into something warm and clear.