Gilbert would be NN Bertie, I think.
Wilfred I LOVE but our surname begins with F... Does this ruin it? It's almost impossible to say 'Wilf Our Surname', but then he could be Fred/Freddie?
My Mum has suggested Walter. Am I right in thinking she is crazy (or am I crazy - Walt is growing on me a bit, but he'd be Wally, wouldn't he....)
Sorry - stream of gibbering consciousness. Very tired!