Well, I found out that petrichor is the word for the smell after it rains, and I thought that was beautiful and so I wanted to make a name out of it. Knowing that in ancient Rome, they would take a male name and add an 'a' to the end of it to make it feminine (Julius would make Julia, Alexander=Alexandria, etc). So I did. And here I am.

Oh, also, I've always liked the name Petrie (because of the red-head girl from Biodome), and Petrie is a diminutive of Petra.