There was a settlement at or near Abernethy in Roman times, and as early as 700 AD it was a place of significant political and religious influence in the Pictish kingdom. Today it is a fairly small village of around 1,000 people.
Abernethy families have spread far and wide since those early times, including across the sea to Ireland. When a property valuation survey was conducted in Ireland from 1848-64 it showed 68 Abernethy households in the whole of that country, but 59 of them were in the six northern counties. This concentration of Scottish names in the north strongly suggests that the Abernethys of Northern Ireland immigrated from Scotland as part of the Protestant plantations from the 1600s - an attempt to subdue the northern part of Ireland through settlement by Scottish and English landowners and immigrants.
And so in 1808 we find the birth of two probable descendants of these 17th century immigrants - William Abernethy, born in County Tyrone, and Elizabeth West, born the same year in neighboring County Armagh.