Jaantje is a ♀ female name.
Jaantje is a Frisian and Dutch diminutive of the name Janna or Johanna.
Jaantje means “little Janna” or “Yahweh is gracious” (from Hebrew “jô/יֹו” = referring to the Hebrew God + “chanan/חָנַן” = to be gracious/to show favour).