Im trying to name my baby, please help?

My husband and I have been thinking about our unborn child, if is a girl, we will name her kimberley but we need help with a middle name, if we have a boy it will be cole james, we have been together 8 years and I had always assumed we would spell it, cole but I guess my husband wants to spell it coal, I told him no but he wont budge. What do you think? Do you think coal is ok? Please help with a girls middle name and the spelling?