Izzy is usually a nickname for Isabel, a good nickname for Lauren is Lau (pronounced Law) but a nickname is there for a reason, it doesn't have to match the birth name, just has to suit the person.
Isabel, Mariana, and Christina sound great I was thinking of these of the top of my head, so hope one of these sound good :) If you would like me to think of others e-mail me at cra123456@yahoo.com
If you like 'Nan' as a nickname, then yes, it is a good nickname.
A good nickname for what? Sounds a bit pansy
It does not require a nickname.
A good nickname for Zekrom would be "Black Dragon".
Jaz might be a good nickname
A good nickname for Sheila could be Shei or Shelly.
Well my friend is called Kristen her nickname is krissi.
The Traveling Queen Isabella I was called Isabella la Catolica, Isabel the Catholic, because she was quite religious.
Kenster, Ken, Kenny...
A good nickname for someone named Christian could be "Chris" or "Cris" for short.