Jantje

Jantje is a Low German and Dutch diminutive of Jan, itself the Dutch and Low German form of the Latin Iohannes, which derives from the Hebrew Yohanan meaning God is gracious. It functions as both a masculine and feminine pet form in the Netherlands and northern Germany, often used affectionately for children named Jan or Johanna. The name is closely related to Janneke, Jannie, and Johanna, as well as the broader family of John-derived names found across European languages.