Rainer Maria Rilke's birth name is Rilke, Karl Wilhelm Johann Josef Maria.
Maria Rainer who later becomes Maria von Trapp.
See the blog post I linked below for an explanation of how to pronounce her name.
Rainer Meifert's birth name is Rainer Meiffert.
Rainer Hauer's birth name is Rainer Hermann Hauer.
Rainer Barzel's birth name is Rainer Candidus Barzel.
Rainer Gombos's birth name is Rainer Peter Gombos.
Rainer Kaunisto's birth name is Rainer Aaro Uolevi Kaunisto.
Rainer Bertram's birth name is Rainer Hans Clemens Schink.
Jeanne Rainer's birth name is Jeanne Allyn Rejaunier.
Kaj Rainer's birth name is Kaj Rainar Hendunen.
Margrit Rainer's birth name is Margrit Rosa Sandmeier.