The only information I have on John Brahan was taken from a book titled: "Century of Light", History of Brahan Lodge.
The Brahan Masonic Lodge was named after Robert W. Brahan, son of General John Brahan who served with distinction as a Brigadier-General on the staff of Andrew Jackson in the Battle of New Orleans.
Robert W. Brahan (according to the book) was born at Lockland, near Nashville, Tennessee, June 9, 1811.He married Martha Haywood, daughter of the distinguished Judge, John Haywood of North Carolina.In 1835, Robert and Martha made their home in Alabama.In 1840, Robert and Martha moved to Mississippi and 1854, they moved to Texas and settled in Guadalupe County near La Vernia, Texas. (La Vernia is in Wilson County and the Cibolo Creek separates Guadalupe Co. and Wilson Co.). Robert Brahan was a physician.
The book goes on to state that Robert W. Brahan numbered among his kin some distinguished personalities in Alabama, Tennessee, and Mississippi; among them, his brother-in-law, Governor Patton of Alabama, to whom he was planning a visit at the time his death.Robert Brahan was buried with full Masonic honors in Concrete Cemetery (Guadalupe County, Texas), April 16, 1885.