« Reply #3 on: Tuesday 25 February 14 22:19 GMT (UK) »
With the introduction of civil birth certificates in Scotland in 1855, registrars were not allowed to put the father' name on the birth certificate of an illegitimate child unless the father attended the registration or gave written consent. The child also had to have the mother's surname on the birth certificate.
You could check the children's marriage certificates to see whether they name their father. Also follow them in the census to see whether they ever use another surname, or have a surname as their middle name. It was not unknown for a child to be registered with the mother's name but appear in the census with the father's surname. And illegitimate children often used the father's surname as a middle name.
Illegitimacy was investigated by the kirk session, but this was prior to 1845 when the church was responsible for taking care of the poor - the session wanted to know the father of an illegitimate child in case the child became a charge on the parish. After the Poor Law of 1845, the kirk was no longer responsible for administering relief payments to the poor and so was less inclined to chase up the parents of illegitimate children.
AYRSHIRE - Strachan, McCrae, Haddow, Haggerty, Neilson, Alexander
ABERDEENSHIRE (Cruden and Longside) - Fraser, Hay, Logan, Hutcheon or Hutchison, Sangster
YORKSHIRE (Worsbrough) - Green, Oxley, Firth, Cox, Rock
YORKSHIRE (Royston and Carlton) - Senior, Simpson, Roydhouse, Hattersley