Hi Zander,
there are some Rainey/Rennie family members on the 1901 and 1911 Ireland Census, living near the coast close to Ballycastle, they were farmers, presbyterians, the family members are;-
Johnb1840 Torr Head died between 1901 and 1911, he married Mary Jane McClarty in 1875 in Cushendall, she died in 1899, they had 5 sons,John b 1878 Ballycastle,James b 1876 Ballycastle,Samuel Lyle born 1880 Ballycastle, David b 1883 Ballycastle and Charles b1887 Ballycastle
of the 5 sons it looks like only John remained in Antrim,Charles emigrated to USA,Samuel Lyle went to South Africa,David went to Australia, joined the AIF and was killed in action in 1917, and as you know I am trying to find James !
hope this makes sense, Vanessa