And Ram begat Amminadab, and Amminadab begat Nahshon, prince of the children of Judah;
Caleb the son of Hezron is not Caleb the son of Jephunneh; they are different men entirely, despite the shared name. Azubah and Jerioth are most likely the same woman under two names rather than two separate wives, since only one set of sons is listed. The Targum's claim that Azubah was barren contradicts the text itself, which names her three sons.
AI summary
And Ram begat Amminadab; and Amminadab begat Nahshon, prince of the children of Judah; (d) That is, chief of the family.
Between Nahshon, prince of Judah at the Exodus, and Pharez at Jacob's descent into Egypt lay 430 years, yet only three names bridge that span. Several links are passed over. From Nahshon to David, over 400 years compressed into four generations, Salma, Boaz, Obed, Jesse. The genealogies omit the less famous ancestors, preserving only those whose names mattered to the record.
AI summary
Commenting on 1 Chronicles 2:10-15