Jennie is a ♀ female name.
Jennie is today considered as a diminutive of Jennifer. Originally, it was a medieval diminutive of the name Jane/Jean (from Johanna).
Jennie means “white fairy”, “white phantom” (from Welsh “gwyn/gwen” = white/fair/blessed + “hwyfar” = smooth/soft or phantom/spirit/fairy) and “Yahweh is gracious” (from Hebrew “jô/יֹו” = referring to the Hebrew God + “chanan/חָנַן” = to be gracious/to show favour).