Pledge or oath
Nelsy is a diminutive or variant of the name Nilsa, which is often considered a Spanish or Latin American short form of Leonilsa or a variant of the Scandinavian name Nilsine. It is ultimately linked to the name Nicholas or the Germanic name Giselle, meaning 'pledge' or 'hostage'. In many Spanish-speaking communities, it serves as a modern, rhythmic stand-alone name.
About 10 girls were named Nelsy in 2025.
US births per 5-year period, 1990–present (SSA data).
