There are a few of these I wouldn't count as
Aiden rhymes, the chief one being
Adan, which is the Spanish form of
Adam and is pronounced "ah-dahn". Probably some of the Adans are respellings of
Aiden, but many of them are also Hispanic babies where the name is being pronounced in the traditional Spanish way.
Madan is also a name from
India that I doubt is being pronounced like "Maiden."
http://www.thehindu.com/news/national/article3419213.ece
And I would bet the parents who have named sons Maden and Madon are thinking of them as variations of Madden and don't realize they're creating confusion with "Maiden."
But it's still a remarkable total.