There now appears to be a daughter of Daniel Maitland and Jean Buchanan.
Marion Maitland, b. 1834 has parents Daniel Maitland (labourer, dec.) and JANE Maitland, m.s. Buchanan.
It wouldn't be unusual for a mix up between Jean and Jane to Occur when the registration was taking place.
Marion's place of Birth is listed as Kirkintilloch, Dunbartonshire, which is just along the road from Milton of Campsie, or Campsie in general, so there may well be a link to the other Campsie Maitland's there.
Still been unable to unearth any paperwork on Daniel and Jean/Jane though..........