No you can't change the child's last name without her FATHER's permission. OKay? Real simple. You don't get to make that choice unilaterally. And keep being impertinent and you will get no answers to any of your threads.
Parents should remember 3 things: Love your kids more than you hate your ex; when you have children the relationship with the other parent is until death; your children determine what type of nursing home you end up in.
Nothing stated by me should be taken as giving you legal advice or forming an attorney/client relationship.
Attorney-GAL in Ohio.
I've removed the knife from my back, polished it, and will one day return it -- long after you think I have forgotten.