Having gone round in circles with the McLeans in my tree, I thought I'd have a look at this.
On Family Search, there is a James Laurie baptised in 1750 in Maryculter. Parents are Charles Laurie and Mary Ross.
This public tree on Ancestry appears unsourced at first glance, but has lots of info.
http://trees.ancestry.co.uk/tree/354...rson/631481392