According to the Bible, one of Noah's grandsons was Magog / מגוג (Genesis 10:2; Chronicles 1:5). Biblical scholars generally believe that Magog was intended to be the ancestor of the Scythians, north of the Black Sea. Two of Magog's sons were named in the 16th century Book of Jasher: Elichanaf / אליחורף and Lubal / לובב (Book of Jasher 7:4; ספר הישר - פרשת נח).
Irish legend gives Magog another four sons: Bathath, Faithechta, Jobbath, and Emoth. According to the 11th century Lebor Gabála Érenn (Book of the Invasions of Ireland) and the 17th century Annals of the Four Masters, these sons were the ancestors of the Irish kings.
These lines from the Irish kings back to Adam and Eve entered the genealogical mainstream in the works of John O'Hart (1824-1902). They now appear in thousands of Internet genealogies, but cannot be considered an authentic tradition.