milkman -
A man who delivers milk to households and sometimes businesses early in the morning.
Wikipedia
A milkman is a person, traditionally male, who delivers milk in milk bottles or cartons. Milk deliveries frequently occur in the morning and it is not uncommon for milkmen to deliver products other than milk such as eggs, cream, cheese, butter, yogurt or soft drinks. Originally, milk needed to be delivered to houses daily since poor refrigeration meant it would quickly spoil.
