Nenad

Definitely means 'unexpected', as it is derived from the Serbian folk epic of Predrag and Nenad, twin brothers. The mother had prayed for a child, and having given birth to him declared him too be "too dear" (pre+drag) but to her surprise gives birth to an unexpected second son, Nenad (from "ne nadati se", not expected, or "iznenadjena", surprised. The pair of names remains popular for twin boys in Serbia, and the occasional "oops" baby gets the name Nenad.