Our family is growing by one this August.
I really like the name Dagny.It is my absolute favorite on your list and I am thinking of stealing it for my future daughter! When I first saw it I immediately thought DAG NEE. DOG NEE never even crossed my mind until you said it.. I have never heard the name before so i have no idea what the "correct" pronunciation is and I would think most people would be the same since it isn't that common of a name. But whatever the case, I think that everyone your child meets will get so used to saying it that way that it will feel right when they see her.
Dagny pronounced Dog Nee??
I LOVE 90% of what you suggested for a boy.
Dag is yes pronounced more like dagger