Thorkild Jacobsen proposed that the Sumerian name Ningishzida can be explained as “lord of the good tree.” This translation is still accepted by other Assyriologists today.[1][2] Various syllabic spellings are known, including dNi-gi-si-da, dNin-nigi-si-da, dNin-ki-zi-da and dNin-gi-iz-zi-da.[1]
While “nin” can be translated as “lady” in some contexts, it was grammatically neutral in Sumerian and can be found in the names of many deities, both male (Ningishzida, Ninazu, Ninurta, etc.) and female (Ninlil, Ninkasi etc.).[3]
Ningishzida could also be called Gishbanda (“little tree”).[4]
https://en.wikipedia.org/wiki/Ningishzida