Hi Patricia,
These are the only Samuel Call (+ surname variants) baptisms from www.rootsireland.ie/ - none for 1775 I'm afraid:
Perhaps the 1738 was his father or uncle?
Name:Samuel McCallDate of Birth:
Date of Baptism:22-Feb-1738Address:LisburnParish/District:BlarisGender:
CountyCo. Antrim
Denomination:Church Of Ireland
Father:Samuel McCall
Name:Samuel CallDate of Birth:
Date of Baptism:19-Apr-1794Address:DownParish/District:DownGender:
CountyCo. Down
Denomination:Church Of Ireland
Father:Samuel CallMother:Elizabeth
Do you know if they were protestant or R C?
Early burial records for Call & variants (1600 to 1800) are from Tyrone Down Derry Limerick & Antrim, so hard to pin down
Early marriages are from the same as are baptisms with Armagh in the mix also.
The Tithe Applotments (free at http://titheapplotmentbooks.nationalarchives.ie/ ) have 26 Calls in 9 different counties 1824-34!
Would dna testing help to narrow it down perhaps?
Col