Bryce Gray of Lanarkshire

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Hi,
   Can anyone help with the following?

I have a Bryce Gray marrying Jean Beatty/Beattie (daughter of Robert) on 11 December 1772 at Barony Lanarkshire. From what I can see there are three children (possibly more?): Robert Gray born 28 July baptised 30 July 1775, Barony, Lanark, Bryce Gray born 24 May, baptised 28 May 1780, Barony, Lanark and John Gray born 17 May, baptised 30 May 1784, Barony, Lanark.

I believe Bryce Gray who married Jean Beattied may be a relation? On the baptism of an ancestor - Christopher Thomson in 1777 in Lanark (son of Christopher Thomson and Margaret Gray), Bryce Gray is one of the witness at the baptism?

Cant find a baptism for Bryce Gray around 1740 - 1750 which would tie in?
Any help much appreciated!