The word daddy is not defined by wether or not a man has a biological child. You can never produce a child and be a daddy, likewise you can have 20 kids and never be a daddy.
A daddy is a man who cares for a child's both physical and emotional needs. He puts the child's wants and needs ahead of his own.
A man who does a half ass job of raising his child is usually rewarded with drug addicted, nympho, wife beating, jail bird's
- these men a frequently but not always known as baby daddy's
A true daddy
is hard to come by, but and a truely special thing.