You have the formula and symbols wrong but it is probably nickel acetate.
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Non-existantane?
That is, there's no such compound, so there's not really much point in working out what the name is.
magnisum oxide
This is not a true compound but is mixture of Ammonium fluoride and Hydrogen fluoride , NH4F . HF
The correct name is mercury(II) sulfide.
Iron (II) oxide.
GeH4 is called germane, germanium hydride, geranium tetrahydride, or monogermane.