This is a cool challenge. I really hope that they go for non-ayden names.
It could also be interesting if they picked the same name but chose different variations on it; ie
Henry and Harry,James and
Jacob,
John and Ivan/Ian. That way each boy gets his own unique name but with a distinct tie to the other.
Other ideas with the different spellings:
Nicholas and
NikolasDennis and
DenisJacob and
JakobColin and
CollinAaron and
Erin (I have seen this spelling for boys)
Peter and
PetrAlexander and
AleksanderChristian and
KristianDylan and
DillonCaleb and
KalebIsaac and
IsaakLukas and
Lucas