The name Tiva means:

  D - DURATIONAL
  A - ATTRIBUTIVE
  R - REFRINGENT
  R - RECREATIVE
  E - EXSERTED
  L - LEGISLATIVE

darrel means:
Beloved

  S - SUM/DIFFERENCE IDENTITIES
  T - TOOLKIT FUNCTIONS
  E - EVEN NUMBER
  R - REGULAR POLYGON
  L - LEMNISCATE
  I - INVERSE SINE
  N - NTH PARTIAL SUM
  G - GAMBLING ODDS

sterling means:
of high quality: pure.: Also variant of a name given pre-medieval refiners of silver meaning easterner. Surname.

  V - VALLECULAR
  E - EQUIPOTENTIAL
  R - RESALABLE
  N - NUTMEGGED
  O - OSSICULAR
  N - NINETEEN

Vernon means:
From the alder grove Spring-like