1 Chronicles 1:50

Overview - 1 Chronicles 1
Adam's line to Noah.
The sons of Japheth.
The sons of Ham.
17 The sons of Shem.
24 Shem's line to Abraham.
29 Ishmael's sons.
32 The sons of Keturah.
34 The posterity of Abraham by Esau.
38 The sons of Seir.
43 The kings of Edom.
51 The dukes of Edom.
Treasury of Scripture Knowledge

1 Chronicles 1:50  (King James Version)
And when Baalhanan was dead, Hadad reigned in his stead: and the name of his city was Pai; and his wife's name was Mehetabel, the daughter of Matred, the daughter of Mezahab.

This variation is occasioned simply by the mutation of [Rysh,] {raish,} and [Dleth,] {daleth;} being in Genesis,
[Hadar ,] Hadar, and here,
[Hadad ,] Hadad. Genesis 36:39

This simply depends on the interchange of [Ywd] {yood} and [Vv] {wav;} being written in Genesis
[Pw ,] Pa, and here,
[Py ,] Pa. Genesis 36:39