I suspect him as my Nicholas' brother.  Nicholas' son John H. went on to name his first son in NY Hiron John.

From They Lived in Somerset County, Maryland, 1726-1750:
29 Jan 1749: Hirom Reddish witnessed the will of John Christopher

From Stepney Parish Records:
Hieron Reddish m. Elizabeth Johnson, widow, 10 Oct 1753
Samuel Radish, born to Hieron and Elizabeth 28 Sep 1756
Thomas Reddish, born to Hiron and Elizabeth 15 July 1757
John Reddish, born to Hiron and Elizabeth

From 1753 Tax List for Wicomico Hundred, Somerset County, MD:
HH 971 - Heron Reddish, head & Samuel Reddish

From Presbyterian People of Wicomico:
29 Apr 1759: Hiron shared pew #9 with Hugh Kennedy, his brother-in-law.
14 Nov 1769:  Hiron pledged 4/2/6 on the cost of a new church and paid 3/17/6.

From Somerset County, Maryland, Wills, Accounts and Inventories, Liber 14:
4 Feb 1773:  Heiron Reddish witnessed the will of Francis Chittam with wife Isabelle.

From An Inventory of Maryland State Papers, Volume 1:
22 Jan 1780: George Dashiell, Comsy., Somerset, to Hiron Reddish, Certificate of Corn.
7 July 1781:  William McBride, Comsy., to Hiram Reddish, Receipt of bacon for taxes.

From 1783 Assessment of Somerset County:
Hiron Reddish, Does Better, 160 1/2 acres south of Wicomico.
Hiron Reddish, Plain Dealing, 50 acres south of Wicomico.

From Presbyterian People of Wicomico:
29 Apr 1759: shared pew #9 with Hugh Kennedy, his brother-in-law.
14 Nov 1769: Heiron pledged 4/2/6 on the cost of a new church and paid 3/17/6.
1775: Hiron paid 3/7/6 as rent for pew #28.

From John Nelm's Store Accounts:
1765 - 29 Mar 1776:  Carried 1/18/6 1/2 from Ledger C and bought a large Bible, paper, tacks, all blades, fum, beer, cordage, bottons.  In addition paid Nelms for 4 1/2 days work done by James Willis and gave credits to Sarah Johnson, John Hayward, Solomon Maglamary, John Noble, George Smith, blacksmith, Elizabeth Pare.  He received credits for soling 1 pr. Shoes and making another, and for 2 barrels of pork.  He carried balance of 6/5/9 1/2 to Ledger E.  Had two sons, Thomas and John, daughter Sarah Johnson and sister Elizabeth Pare.  In 1776 he bought coat buttons and paid cash on 29 March.  Heiron's son Thomas made a pick up for his father on 21 Jan 1776.

Elizabeth Pare bought a psalm book by Watson on 20 Apr 1767, which was paid for by her brother Heiron Reddishin 1768.

Hiron's sister Sarah Reddish (relationship proved by pew rental above), married Hugh Kennedy on 25 July 1745.
The children of Sarah and Hugh were:
Elizabeth Kennedy b. 13 July 1746
John Radish Kennedy b. 12 Sep 1748
Sarah Kennedy b. 12 Feb 1751
William Kennedy b. 27 July 1753
George Kennedy b. 8 Oct 1757