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- n. Alternative capitalization of Higgsino
Sorry, no etymologies found.
But the higgsino is a spin-1/2 fermion and there exists a natural reason why such fermions want to stay light.
Second, the Higgs boson has a partner itself - the higgsino.
Because the Higgs boson is linked to the higgsino by supersymmetry, it would have to stay massless, too.
Dirac mass terms, assuming that Nature completes the neutrinos into electron-like 4-component spinors by additional right-handed neutrinos), it can still be understood why it is a good zeroth approximation to assume that the higgsino is massless.