Donna, I'm curious.
What is your motivation to do such a thing? And what does your latest baby's father have to say about this? Doesn't he want his child to carry his name?
If he doesn't care, then I hope the father of your first five children seeks legal advice before he agrees to let you give this baby his name. The last thing he needs is to get socked with child support for a baby that isn't even his.
P.S. You're 25 and you just had your sixth child?!!? Wow! Any multiples?