1)
Who is Ladan?
1.
Radak: This is Livni mentioned in the Torah and above 1 (6:2).
2.
Malbim: He is a son of Livni. The Beis Av began from him. I explained above that Yachas was a son of Livni. Two Batei Avos descended from Livni - Ladan ben Livni, and Yechi'el was Ben Ladan; Zesam and Yo'el were Bnei Yechi'el (26:22). It seems that Yechi'el and Zesam were generations after Livni, for they were in the days of David.
