Middle name as first names?

[tinylittlestars.livejournal.com]

I was a really big fan of the band Hanson, and was interested to find that all the males of their family go by their middle.

Parents
Clarke Walker Hanson - Goes by Walker
Diana Frances Hanson - Goes by Diana

Children
Clarke Isaac Hanson - Goes by Isaac/Ike
Jordan Taylor Hanson - Goes by Taylor/Tay
Zachary Walker Hanson - Goes by Zachary/Zac
Jessica Grace Hanson - Goes by Jessica/Jessie/Jess
Avery Laurel Hanson - Goes by Avery/Avie
Joshua Mackenzie Hanson - Goes by Mackenzie/Mackie/Mac
Zoe Genevive Hanson - Goes by Zoe

Taylor is married with 2 children
Jordan Ezra Hanson - Goes by Ezra
Penelope Anne Hanson - (Apparently) Goes by Ellie (apparently not by Penny, as Hanson's latest radio release was "Penny & Me")


Okay, so now you think I am really stalkerish, knowing all their families names etc. (being a fan for 10 years does that to you) however what I want to know is what do you think of this? and do you have any idea why a family would use a tradition like this? I guess I've always been interested.