Hello Kim,
In the 1851, 1861, census indexes for the parish of Ayr, are the families below.
1851.
Lawrie Stewart, aged 47y, Ayr,
Lawrie Mary, aged 50y, Ayr,
Lawrie David, aged 25y, Ayr,
Lawrie Rebecca, aged 16y, Ayr,
Lawrie Jane, aged 14y, Ayr,
Lawrie Stewart, aged 11y, Ayr,
Lawrie Helen, aged 9y, Ayr,
Lawrie Thomas, aged 5y, Ayr.
The 1851, index does not give place of birth.
1861.
Lawrie Stewart, aged 57y, Ayr, Born Ireland,
Lawrie Mary, aged 59y, Ayr, born Ireland,
Lawrie Helen, aged 19y, Ayr, born Ayr,
Lawrie Thomas, aged 16y, Ayr, born Ayr.
Regards,
Jonn.