I can pretty well document my ancestry back to this Wair Ker married to Johne Hog, and do have this marriage record. I don't know of any other Vair Ker with the right timing other than this daughter of Sir Thomas Ker of Redden.
I have transcriptions in English and French of Sir Thomas Ker's
'Notebook Containing Jumbled Notes and Memoranda in French and Vernacular by Sir Thomas Ker of Redden 1620-1650'
In this he lists what looks to be 20 children, with at least 3 wives. He lists at least 4 children born after 1644 which I have seen as his death date.
Does anyone have a source for his death date?
Thanks for your interest, and I will try to follow up with ScotlandsPeople regarding Vair's baptism.