Will be short for Alexander. My older son is called Jude. I think if we went with anything other than Alex then we'd have to assert it from the start as my dad has already starting saying Alex, even though he's only been told Alexander - I'm sure plenty of others will do this too! Other name is Nathaniel, but I only really love it in full and am a bit ambiguous about Nat/Nate.
I prefer Alex over Xander but really like Nate as nn for Nathaniel too. I love that your eldest son is Jude, trying to persuade my DH to go for it but he's not quite there yet. Any ideas on how I can persuade him?!
Xander definately, Alex sounds so harsh and is too popular for my liking. We have a Xander but be warned, the second he starts school he WILL be Alex to most of his friends. We've tried to get ds1 to assert himself a bit and ask to be called either his full name or Xander as the only shortening, but it's just impossible