John and Thomas Greg were merchants in Belfast as early as 1774 along with Waddell Cunningham. I don't know if they owned ships or not, but by reading the Belfast Newsletter index, I am guessing they were. Maybe owned the ship Snow Betty. I also read that Thomas' son John went to New York in 1778.
There was an Andrew Gregg in Ballyarnet in 1785.
Cunningham Gregg in Belfast in 1792.
I also read that Thomas Greg had land in New York, U.S.A. and that Thomas was from Belfast. Don't know if this is the same Thomas who was a merchant in Belfast. Andrew Gregg and James Thompson were Londonderry ship owners
Cunningham Gregg was merchant in 1792, Belfast.
John Cunningham was a Belfast merchant in 1795 and BNL mentioned him having a brother named Sam.
BNL_ Thomas Greg probate 1767-1827.
Cunningham Greg probate in 1827 Antrim, Ireland.
The reason I posted this information is because I have been researching information on my 4th great grandfather William Greg who left Northern Ireland in the area of Ballymoney with a John Greg. They boarded at the port of Larne in Oct. 1772 and landed in Charlestown in Dec. 1772 on the ship Lord Dunluce. There were others on the ship with the same surname. They were Mary, Jane, and Ninian Greg. This Greg family left with the 5 ships commissioned by the Rev. William Martin from co. Antrim in N.I. more than likely to escape high land rent prices and the low wages of linen workers at that time.
Rev. William Martin's party of ships were mostly Presbyterian who wanted to leave Ireland for religious freedom and unknown opportunities in the new land.
William Greg was given land in S.C. the U.S.A. in Newberry co. His wife's name was Jane.
I am only guessing that William and family came from Lisburn, Londonderry, or Coleraine. I have no idea how far apart these places are, but they knew Rev. martin so I'd say they were of his congregation.
William Greg was born abt.1743 and was associated with the McCalla family from N.I.
That is where I stand on finding the parents of my William Greg and Greg is how he spelled his name as well as John on the letter of appreciation to the Rev. and ship master, but when they reached S.C I saw there name spelled either Gregg or Gragg in census records.
If anyone is related or could help me out on this matter I would be very grateful. I am getting closer and closer but can't get there.
Thank you all and I am proud to be a new member of your friends and researchers.

Frances Gragg Warren