User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-7594114-20130621070430/@comment-4649443-20130624024039

In my 1980's World Book Dictionary, both are acceptable. I mean, it's like pancakes and flapjacks! Also according to the dictionary:

Gaea is pronounced jee-ah

Gaia is pronounced either gay-ah or guy-ah

Just so you know.