Hi there - what an amazing project - I'm in awe of it!  I wondered if there were any Mcfaddens (sometimes alternate spellings of the surname were used)  buried in St Josephs Airdrie, pre 1875?  As I know my McFaddens worked there intermittently, and may in particular have had children who died that I'm not aware of.
If this is too general/time consuming a request, then apologies, and no need to feel obliged to respond  
Spelling is a lot down to the person recording the burial. Here's what I have so far and the variant spellings....
Hugh   McFadian   03/01/1862 (64)
Patrick   McFadin    (24)
Isabella   McFadyen   25/01/1869 (2)
John   McFadyen   08/11/1869 (No age)
Mary   McFadyn   30/03/1863 (60)
Jane   McFaydan   05/02/1866 (80)
Frances   McFayden   13/11/1863 (4)
Jane   McFayden   15/11/1863 (No age)
Chris