c.1600, rare nativized agent noun from survive.
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for surviver
Agesilaus the surviver of them fell, and counterfeiting himself dead, gained an opportunity of escaping.Reflections on the Rise and Fall of the Ancient Republicks
Edward Wortley Montagu
The mysterious pain of partings presses upon the returned traveller and the surviver with nearly equal force.Retrospect of Western Travel, Volume II (of 2)