He was born about 1783 in Carlisle, Cumberland County, Pennsylvania and his parents were William Hays and Mary Ludwig.
John Hays married in Nov 1802 in Carlisle, Cumberland County, Pennsylvania, USA to Elizabeth "Betsy" Reinhart  (daughter of Maria Elizabeth (Pfoutz) & Frederick Reinhardt, b: 1757].
During the War of 1812, John Ludwig Hays was listed as a Sergeant in the muster-roll of Capt. Wm. Alexander's Company of volunteers, belonging to the Fifth detachment of the Pennsylvania militia, under the command of Col. James Fenton, at Carlisle. 
He died on 20 Mar 1856  and was buried at Old Graveyard in Carlisle, Cumberland County, Pennsylvania. 
William R. Hays, b: c1808 PA
George Hays, b: 17 Mar 1812 PA; d: 01 Jun 1862 m: Anna Ellen McPHATE=McFATE, b: 15 Dec 1820; d: 13 Sep 1884
Elisa Hays, b: c1821
John A. Hays, b: 1822; d: 1896 m=Catherine (unknown), b: 1833; d: 1893
Frederick R. Hays, b: Nov 1824; d: 28 Jun 1906; m: Catherine (unknown), b: 1825; d: 1915.
↑Pennsylvania and New Jersey, Church and Town Records 1669-2013 compiled by Cumberland County Historical Society for John Hays married in Carlisle, Cumberland County, Pennsylvania, USA to Elizabeth "Betsy" Reinhart; citing wedding notice published in the "Carlisle Herald" on 24 Nov 1802 which stated "Married Thursday last by Rev. Dr. Nisbet, Mr. John Hays to Miss Betsy Reinhart, all of this town".
↑U.S., War of 1812 Service Records 1812-1815 on ancestry.com citing microfilm#M602 roll box#95 for John L. Hays, Fenton's Company, Regiment#5, Pennsylvania Militia, rank: induction - Sergeant.