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I think some of the other correspondents will be able to give you more information. However, I know that the Hanna's were an important family in the parish of Connor, town of Kells, and townland of Kildrum, County Antrim, at the time my family was there (maybe 1800 to 1850). They seem to have been major entrepreneurs in the linen industry with linen works there. It would be worth doing some research in that area although records are hard to find.
Julia.

Thanks aaid, I am setting out below the details I took of the Kennedy graves at Connor. I suspect your John is John Kennedy of Lisnevanagh who I think is a brother or cousin of Josias. He could be a brother of my Jane and Margaret:

JOHN KENNEDY OF LISNEVANAGH (adjoins Kildrum), B C 1780
 
Margaret, d of above, b c 1814, D 21 Sep 1833, 19yrs
James, s of above, b c 1806, d 16 Jan 1842, 36 yrs
John, s of above, b c 1812, d 10 Apr 1845, age 35
William, s of above, b c 1802, d 5 Aug 1847, age 45
Josias, b c 1819, d 19 Sep 1869, age 50
Anthony, b c 1841, d 22 Oct 1889, age 48, grandson (s of Josias?)

JOSIAS KENNEDY OF CARNAUGHT, B C 1770, D 6 FEB 1838, Age 68
Sarah, wife, b c 1778, d 6 Feb 1846, age 68
Elizabeth, d in law, b c 1814, d 24 May 1888, age 74.
Josias, s of above, b c 1811, d 5 Jan 1896, age 85 (of Kildrum on death, Executors James
     Thompson and George R Hanna, both of Kildrum).
Mary Jane Thompson, niece of Josias jnr, b c 1880, d 9 Sep 1882.
(Obviously Josias snr and Sarah also had a daughter, married to Thompson)

WILLIAM KENNEDY, B C 1695, D 9 APR 1756, Age 61 (Grandfather of Josias?)
Helen, wife, b c 1701, d 10 Mar 1767, age 66
John, son, b c 1727, d 21 Feb 1783, age 56
Josias Kennedy of Carnaughts, b c 1770, d 6 Feb 1838. Josias seems to be son of John.

WILLIAM KENNEDY OF SLATT, B C 1756, D 19 Aug 1837, age 81.
John, son
Mary, wife of John, b c 1798, d 14 Aug 1838

WILLIAM KENNEDY OF CARNAUGHT (LATE BALLYMENA), B C 1812, D 29 Aug 1851, age 39 (Son of
     Josias?)
Anna, wife, d 1 Oct ? , age 57
Josias, son, d in infancy
Jane Hanna, granddaughter, d in infancy
Annie Jane Hanna, b 1870, d 16 Feb 1871, age 10 mths.
Josias Kennedy Hanna, b 1874, d 29 Jun 1874, age 7 wks.
(A daughter of William and Anna married Hanna)

It is very difficult to find any information on these families, though I am still trying to link them to the Cassilis descendants. It seems that Elizabeth Wilson, nee Kennedy, who can certainly be traced to that line, was living in Connor when she died in 1802.