Nothing too crazy.
And please stay away from Tank Engines. 
We are currently considering:
Ethan (dh hates it)
Rhys (not too sure as it is a lovely name, but also the name of my half-brother who we don't see too often, but we do get on with him).
Also, Michael and Alexander are out - Thomas already has these as his middle names.
Which is a shame as they are also lovely.