Brian White, an engineer at Google who deeply involved in Google's search quality, posted a Google + post with some detective work.
Brian White wanted to see who "Profile Zero" on Google + is. So he decided to sniff around the Google robots.txt file and found a sitemap file at gstatic.com/s2/sitemaps/profiles-sitemap.xml. The first sitemap file referenced there listed the first profile as Raj Pudota.
Truth is, and Brian White said it, "I actually don't know if this is a "canonical first profile" or anything--it's just the first one listed."
Technically, this is extremely not likely. The first Google + user was probably a Googler working on the project.
If you look at Facebook, you can see profile number 4 is Mark Zuckerberg. Just try facebook.com/profile.php?id=4, notice the id=4. Who is number one? Someone named Rosa Angelica Alba.
Anyway, any ideas who has the first Google + profile?
Forum discussion at Google +.