  Orbifold grand unified theories (GUTs) solve several problems in GUT model
building. Therefore, it is intriguing to investigate similar constructions in
the flavor context. In this paper, we propose that a flavor symmetry might
emerge due to orbifold compactification of one orbifold and broken by boundary
conditions of another orbifold. The combination of the orbifold parities in
gauge and flavor space determines the zero modes. We demonstrate the
construction in a supersymmetric (SUSY) SO(10) x S_4 orbifold GUT model, which
predicts the tribimaximal mixing at leading order in the lepton sector as well
as the Cabibbo angle in the quark sector.
