Siblings' names include Robert, Margaret, Mary, Constant/Constance, Rachel, Sarah, Thomas, and Isabella
Died June 11, 1815 in Brushy Creek, Union, South Carolina, USA
Descendants attached to John include just two (excluding common names of Robert, Margaret, Mary, Sarah & Thomas) who might have been named for mother/sibling of the John Boyd who died in South Carolina:
Margaret Lucretia Bell (July 12, 1842 - August 8, 1908)
More information is needed to determine whether Boyd-312 and Boyd-1084 are a match or not. The lack of recurring names of Lucretia, Constant/Constance, Rachel, or Isabella among Boyd-312 descendants (& Boyd-1084's death in South Carolina when Mary was married in North Carolina and died in Tennessee) argues for "not".
Daughters of the American Revolution, DAR Genealogical Research Databases, database online, (http://www.dar.org/ : accessed August 1, 2016), "Record of John Boyd", Ancestor # A013350.
The DAR has a record for a John Boyd b Ireland 1715 with service "on the frontier" - Bedford Co. (Virginia)... maybe this John? DAR has his service as PA, but he could have immigrated from Ireland to Pennsylvania & then moved to Virginia/NC after serving there (DAR has death in PA, but also notes that his service is inconsistent with his residence).
Sources
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John:
DAR record for John Boyd b Ireland 1715, service "on the frontier" - Bedford Co. (Virginia)... maybe this John? Has his service as PA, but he could have immigrated to PA & moved to Virginia/NC after serving there (DAR has death in PA, but a note that his service is inconsistent with his residence).
http://services.dar.org/Public/DAR_Research/search_adb/?action=full&p_id=A013350