LOGAN ALEXANDER ALEXANDER LOGAN/ 10/03/1739 EDROM
LOGAN JAMES ALEXANDER LOGAN/ 21/05/1758 HUTTON
LOGAN ELIZABETH ALEXANDER LOGAN/ SMITH 10/04/1762 LADYKIRK
The only Mary I can see in Scotland on SP seems unlikely.
LOGAN MARY ALEXANDER LOGAN/ISOBEL EWEN 08/07/1753 STIRLING
I do not see a marriage or death on SP for Alexander.
You may have seen the information below.
https://en.wikipedia.org/wiki/George_Logan_(minister)
This makes reference to Ormiston in East Lothian.
I note the birth baptism you mention
LOGAN ALEXANDER GEORGE LOGAN/ANN HOME 08/09/1714 LAUDER
These are birth/baptism records for Ormiston, East Lothian
Parents ALEXANDER LOGAN/ELIZABETH, or BETTY WOOD
GEORGE 26/10/1748
THOMAS 6/05/1750
CHARLES 14/06/1752
MARGARET 3/11/1754
CAMPBELL 20/03/1757
MILLER 20/05/1759
FRANCIS 27/07/1762
George Logan & his wife did have children in Lauder whilst he was minister there including Alexander but was it your Alexander?
Colin