A dozen Barnetts come up when you search the name with Kilgreel on the PRONI will calendar. Here’s a couple of snippets I have previously noted down.
[BNL 15 May 1873]
BARNETT: At Windyhill, Roughfort, William Barnett formerly of Greencastle, aged 70 years. His remains will be removed for interment in Templepatrick, to-morrow (Friday), at twelve o'clock noon. Friends will please accept this intimation.
Roughfort is in Craigarogan, next to Kilgreel. His will mentions wife Mary Eliza and sons William and Henry Kelso.
[BNL 8 Oct 1850]
Oct. 3, in the Remonstrant Meeting-house, Templepatrick, by the Rev. Joseph Nelson, Henry Barnett, Kilgreel, to Anna Matilda Kelso, Ballynabernice, Templepatrick.
^ I think Henry’s father was probably called John, going by the Ulster Historical Foundation index.