If you click on the links for your childrens' names, you will see a link in the entry labelled "popularity". If you click on that, you will see the US popularity for that name. The links are in your post, but here they are again:
Alexia MadelynDonovan AlexanderLachlan CraigAddison MatthewRylan BrookMcKenna Elizabeth
As a side note,
Lachlan is a lot more popular in Australia than in the US.
I see that you've made the same post on the opinions board - people will give their opinions there (and
not on this board).
:-)