They all sound like Biblical names, with the exception of Hank.
The Book of Hank. Imagine!
Hank isn't part of the O2 line, though, so that might be why that connection isn't there.
Regardless, I am a bit curious too. It would be cute if they were made to sort of represent the personalities of people who are affiliated with Tantus (as I doubt they're modeled after, er, "personalities").