Posthumus is a surname mostly stemming from the Dutch province of Friesland. Among variants are Posthuma and Postmus. The surname may have originated in the same way Romans called boys and girls born after the death of their father Postumus and Postuma, and the common Frisian name Postma sometimes is a derivative of such a name. Alternatively, the situation is reversed, with the surname Postma or Postema morphing to "Posthuma" and further to "Posthumus". People with this surname include:Bryan Posthumus, American politician Chad Posthumus, Canadian basketball player Cyril Posthumus (1918–1992), British motoring journalist Dick Posthumus, American (Michigan) Republican politician Hans Posthumus (1947–2016), Dutch football striker Herman Posthumus (c.1513–1599), Dutch painter and architect Johannes Posthumus (1887–1978), Dutch gymnast Kees Posthumus (1902–1972), Dutch chemist and university president Lisa Posthumus Lyons, American (Michigan) politician, daughter of Dick Nicolaas Wilhelmus Posthumus (1880–1960), Dutch economic historian and political scientist, husband of Willemijn Siep Posthumus (1910–1987), Dutch Labour Party politician Sieta Posthumus, Dutch freestyle swimmer Willemijn Posthumus-van der Goot (1897–1989), Dutch economist, feminist and radio broadcaster, wife of Nicolaas
