Christopher Irvin M.D. 1674
Something I found that may help someone.
http://archive.org/stream/scotsarmy166116800daltuoft/scotsarmy166116800daltuoft_djvu.txthttp://archive.org/stream/scotsarmy166116800daltuoft/scotsarmy166116800daltuoft_djvu.txt
THE SCOTS ARMY, 1661-1688 53
NON-REGIMENTAL APPOINTMENTS, 1666-1684.
MUSTER-MASTER-GENERAL.
Major [Wm.] Arnot, 1 1666.
COMMISSARY-GENERAL.
Sir Wm. Bruce, 2 Knt., Jan. 1667.
PHYSICIAN AND SURGEON-MAJOR.
Commission to Christopher Irvin, 3 M.D., Chirurgeon-
Major to the Guards in Scotland to be Physician
and Surgeon-Major to all the Forces - Whitehall, 23 Dec., 1674.
In this book it does list other Irvin/Irvings. Have a look.