The name is alright, just be aware that most states in the Great Lakes region have a town named Merrill. Maybe a decent place name if the towns named Merrill were any more recognizable.
My name is Merril with one L not two, but they don't have my name. I love my name a lot, but it annoys me when people pronounce it wrong. There is a school in my town called Merrill, and there is a shoe brand called Merrell.