What I have a Spanish milled dollar dated 1776 it and in good condition for it age .there a man name Carlos on it?

The name is Carolus- Spanish for Charles. Value will depend on condition, and we can't judge that over the internet, You need to take the coin to a coin dealer. IF it is original, value can vary from about $50-$350. HOWEVER- there is a modern Chinese reproduction that is a copper cored coin, worth about a dollar.