This study reviews characteristics of biblical personal names of the ‘United Monarchy’, and compares them with those of the ‘Divided Monarchy’. The comparison reveals that, while ‘Divided Monarchy’ names have similar characteristics in both Kings and Chronicles, the characteristics of ‘United Monarchy’ names differ, suggesting different sources for much of the ‘United Monarchy’ onomastica. Both sources, however, show the same remarkable onomastic evolution from the ‘United Monarchy’ to the ‘Divided Monarchy’, which may reflect the spread of Yahwism in the biblical narratives. This evolution is similar to that attested in the epigraphic evidence from a later period – from the 9th and 8th centuries to the 7th and early 6th centuries BCE.