  We construct a $Z_8$ model for leptons where all Yukawa couplings are of
order unity, but known lepton masses are generated radiatively, {\it order by
order}. The seed is provided by fourth generation leptons $E$ and $N$, which
receive (Dirac) mass in usual way. Two additional Higgs doublets with
nontrivial $Z_8$ charge are introduced to give nearest neighbor Yukawa
couplings. Hence, nonstandard Higgs bosons are flavor changing in an unusual
way. Loop masses are generated when $Z_8$ is {\it softly} broken down to $Z_2$.
However, $e$ and $\mu$ mass generation require new Higgs bosons to be at weak
scale. Neutral scalar mixing underlies $m_\mu/m_\tau \gg m_e/m_\mu$,
$m_\tau/m_E$. The $Z_2$ symmetry forbids $\mu\to e\gamma$ and $\tau\to
\mu\gamma$. The most stringent bound comes from $\tau\to \mu\mu^\pm e^\mp$. The
model has interesting implications for $\tau\to e\gamma$, $\mu \bar e \to
\bar\mu e$ conversion, $\mu\to e\nu_e\bar\nu_\mu$, and FCNC decays of $E$ and
$N$ (such as $E\to \tau e^\pm\mu^\mp$).
