Hi
Checked the Carlisle records, could only find one family of ST CLAIR IN CARLISLE IN 1861. Elenor St Clair born 1832 Carlisle and Susannah St Clair born 1859 Carlisle.
There was a Dunbar family in Carlisle in 1841, John born 1811, Scotland, Agnes born 1829, Elizabeth born 1834, james born 1836 . All born CARLISLE.
Both familys living in the same Parish. There was another Dunbar family in 1851 in Carlisle but none of the names you mentioned.
Checked the earliest Carlisle Directory of 1811 no St Clair or Dunbar or Sinclair.