Likely a pet form of names such as Vania or Vanessa, used as a soft, affectionate short form.
Vanie is likely a pet form of names such as Vania or Vanessa, used as a soft, affectionate short form. That nickname quality gives it a sense of warmth and informality, even when used as a full given name.
The name feels light, gentle, and adaptable. Vanie is the kind of brief form that can seem both intimate and modern, especially in naming cultures where short soft-sounding names are valued. Its simplicity is part of its charm.