My great grandmother, Margaret, was illegitimate, born to Jane Young and James Greig on 5 July 1877 in Bogandreep Parish, Strachan, Kincardineshire. James was born on 20 Oct 1848 in Strachan to John Greig and Christian Durward. He was baptized on 13 Nov 1848 in Strachan.
Since he never married Jane, I have been unable to locate anything further for him that I can positively identify. Jane went on to marry David Alexander when Margaret was about three, so she was raised with his name, leading to a lot of misidentified genealogy.
Margaret's birth record provides his surname only, but her marriage record contains father's name as James Greig. The text from the OPR on ScotlandsPeople states: ""John Greig at Dalbreck and his wife Christian Durward had a son born 20th October baptized 13th November named James."
In ScotlandsPeople, I can find the 1846 marriage of John and Christian, and her baptism on 20 September 1813, but no death records, and no records that I can positively identify as this John Greig. With the limited information I have, I've seen no other spelling used.