  We propose a scheme in that the masses of the heavier leptons obey seesaw
type relations. The light lepton masses, except the electron and the electron
neutrino ones are generated by one loop level radiative corrections. We work in
a version of the 3-3-1 electroweak model that predicts singlets (charged and
neutral) of heavy leptons beyond the known ones. An extra U(1)_Omega symmetry
is introduced in order to avoid the light leptons get masses at the tree level.
The electron mass induces an explicit symmetry breaking at U(1). We discuss
also the mixing matrix among four neutrinos. The new energy scale required is
not higher than a few TeV.
