Wilhelm Geiger could be connected via the physicist Max Planck:
Wilhelm Geiger (b.1882, d.1945)
M: Maria Plochmann (b.1858)
M: Albertina Maria Eisenbach (b.1832)
F: Johann Karl Friedrich Eisenbach (b.1799, d.1837)
F: Karl Friedrich Eisenbach (b.1769, d.1834)
M: Maria Rosina Osiander (b.1727)
M: Faustine Margarethe Bilfinger (b.1703, d.1751)
M: Faustine Margarethe Orth (b.1678, d.1727)
F: Johann Philipp Orth (b.1640, d.1696)
Max Planck (b.1858, d.1947)
F: Johann Julius Wilhelm von Planck (b.1817, d.1900)
F: Heinrich Ludwig Planck (b.1785, d.1831)
F: Gottlieb Jakob Planck (b.1751, d.1833)
M: Veronika Dorothea Lang (b.1732, d.1799)
M: Maria Elisabeth Bilfinger (b.1698, d.1762)
M: Maria Veronika Orth (b.1669, d.1742)
F: Johann Philipp Orth (b.1640, d.1696), same as above
Both lines were first validated by Arndt Richter, who also connected the same Orth line to Johann Wolfgang von Goethe and Karl Liebknecht; compare http://goethe-genealogie.de/verwandtschaft/ahnengemeinschaften_personen.html#506.