@wakiams: the use of a father's name is an unconditional right of every child! As long as the father is known,the child has the right to use his name. It is immaterial whether he provide support (financial,material emotional...etc) or not. This simple fact that he is known to be the father is all that matters.
Sometimes adults completely misunderstand the needs [and rights] of children.....that's why so many become 'baba na mama mkate'. They imagine that children place value on material things.
It is very important for a child to know who their father and mother are; even if the parents are absent. Imagine a child who is not able to answer the simple question like 'What ia your father's name?' Surely,how can you not know?
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.