What can Y-DNA analysis reveal about the Scottish Hay noble lineage?

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Stead, Philip and Haddrill, Penelope R. and Macdonald, Alasdair F. (2025) What can Y-DNA analysis reveal about the Scottish Hay noble lineage? Genealogy, 9 (4). 132. ISSN 2313-5778 (https://doi.org/10.3390/genealogy9040132)

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Abstract

The family name Hay (plus associated spelling variants) is a prominent Anglo-Norman-in-origin surname that has been well-documented as a Scottish noble lineage since the 12th century CE. Their historical significance, linked to the rise in the Anglo-Norman era (1093–1286 CE) in Scotland, and the historical complexities of surname adoption post-Norman conquest of England, justifies the need for a comprehensive understanding of the genetic history of the Hay noble lineage. This study focuses on examining the patterns of paternal inheritance in lineages with the Hay surname. We conducted a comprehensive analysis of Y-chromosome data that is publicly available on the Family Tree DNA (FTDNA) platform, and specific FTDNA surname projects, as well as looking in more detail at three well-documented male-line descendants of William II de la HAYA, 1st of Erroll (d. 1201) that have been verified to a high degree of confidence. Our results reveal that all descendants of William II de la HAYA, 1st of Erroll (d. 1201) derive from the multigenerational Y-SNPs R1a-YP6500 (plus equivalent SNPs BY33394/FT2017) and R1a-FTT161. Furthermore, subclades of R1a-FTT161 have been identified that confirm direct male-line descent from two of William II de la HAYA’s sons. Subclade R1a-BY199342 (plus equivalents) confirms direct male-line descent from David de la HAYA, 2nd of Erroll (d. 1241), and subclade R1a-FTA7312 confirms direct male-line descent from Robert de la HAYA of Erroll. The result also confirms that the Hay noble lineage shares the Y-SNP R1a-YP4138 (estimated to have occurred in 832 CE) with several non-Hay test takers that have surnames of Norman origin, therefore providing further evidence to support the Norman origin hypothesis for these surnames. In addition to the identification of multigenerational Y-SNPs associated with documented Hay noblemen, this study has observed significant Y-DNA haplogroup diversity among males with the surname Hay (plus associated spelling variants: Hays, Haye, Hayes, Hey and Haya). Our results show that only 22% of the men sampled (n = 109) with the surname Hay (plus associated spelling variation) are descended from the 12th-century progenitor of the noble Hay lineage of Scotland. Therefore, this confirms that a significant proportion of males with the surname Hay do not descend from the noble progenitor of the Scottish Hay lineage of Erroll.

ORCID iDs

Stead, Philip, Haddrill, Penelope R. ORCID logoORCID: https://orcid.org/0000-0001-6805-0694 and Macdonald, Alasdair F.;
CORE (COnnecting REpositories)