Namesakes: Celebrity, Mythology, and Colors?

[hermione-vader.livejournal.com]

Hey there, I'm a newbie, but I've been obsessed with name for a long time. For the record, my name is Mary Grace, and my siblings' names are Peter and JoJo (short for Josephine).  My favorite names:

Boys:
Nicholas
Christopher
Alexander
Paul
Hugo
Ryan

Girls:
Christina
Isabel
Natalie
Lucy
Evelyn

Anyway, I volunteered at a children's museum for over two years, and I tended to "collect" names that stood out to me.  I stopped volunteering there over a year ago, and these names have stuck with me:

1. A pair of brothers named Jagger and Cash.  What are your opinions on using celebrity last names as nicknames?  Do you think it's good to be obvious like that, or be more subtle, going with "Mick" and "Johnny"?

2. Four siblings named Orion, Griffin, Phoenix, and Azure (three boys and one girl).  Opinions?