I have Aitkens with some of the same names, but the dates are much later than yours. They are from Monymusk, Aberdeenshire. I have an Archibald Morgan Aitken, b.June 1, 1871.His sister was Elizabeth Low(e) Aitken, b.Jan. 7, 1868 and we believe she eventually went to (South Africa?). I'm still trying to put pieces together!