Hi and welcome to Rootschat
It would be helpful if you could give some dates, plus tell us what you have actual documentation for (birth certs, parish registers of christenings etc).
If the people concerned were illegitimate and no father is named on survivimg documents (birth cert, christening etc) that you will never know who their father was. Whilst you may guess based on middle names the child is given, it will be no more than a guess. The name may have been chosen for all manner of reasons (surname of a family who was particularly helpful during a difficult time for example) and not necessarily the name of the father - indeed she may decidedly NOT want to remember the father in this way! So it is not reliable, indeed some would say not fair, to name someone as the father without any survivinmg document on which he is named as such.
