Pavol Hell
Gert Sabidussi
Edmund Hlawka
Nikolaus Hofreiter
Philipp Furtwaengler
Felix Klein
Rudolf Lipschitz (and Julius Pluecker with ancestors
  Christian Ludwig Gerling and Carl Friedrich Gauss)
Gustav Dirichlet (and Martin Ohm)
Simeon Poisson (and Jean-Baptiste Fourier)
Joseph Luis Lagrange (for both Poisson and Fourier)
Leonhard Euler
Johann Bernoulli
Jacob Bernoulli
Gottfried Leibnitz
Erhard Weigel