Shared ground
This paragraph is doing genealogy, but it is not “just names.” It organizes Judah’s early family line in a way that supports later clan tracing. It also preserves a few short explanations—especially why certain people are remembered.
Several explicit claims stand out. Judah’s first three sons are linked to a Canaanite wife (Shua’s daughter). Er, the firstborn, is singled out as “wicked” and his death is directly attributed to Yahweh. The list then includes Perez and Zerah through Tamar, and it explicitly totals Judah’s sons as five.
From there, the text briefly develops two branches (Perez and Zerah) with counted sublists. It also inserts a moral label for Achar as “the troubler of Israel” tied to a serious offense involving something devoted.
Where interpretation differs
How “Tamar … bore him” should be understood. Some read the wording as straightforward fatherhood language: Tamar’s sons are counted as Judah’s sons because Judah fathered them. Others emphasize that genealogies can speak in terms of legal family lines: the point is that the twins are incorporated into Judah’s line and counted as his heirs, even though the circumstances were irregular.
Whether “Achar” is the same person known elsewhere as “Achan.” Many readers think this is the same individual under a different spelling, since both are linked to “troubling” Israel and to taking what was devoted. Others allow for the possibility of a different person, but the matching description makes “same person” the simplest reading.
Which “Ethan” is meant. Some connect this Ethan with other famous Ethans named elsewhere; others think Chronicles may simply preserve a Judahite Ethan within this Zerahite cluster, without requiring identification with a better-known figure.
Why the disagreement exists
The text is condensed and list-like, and it uses relationship terms (“sons,” “bore him”) that can describe biological descent, legal standing, or line membership in genealogical writing. Also, Chronicles sometimes preserves variant spellings of names, and it can place short moral notes into a genealogy without re-telling the full story.
What this passage clearly contributes
Explicitly, it anchors Judah’s line with counted branches (five sons total; two from Perez; five from Zerah) and it marks two key realities: (1) moral evaluation can affect how a person is remembered (Er’s wickedness; Achar’s trespass), and (2) the Judah line continues through Perez and Zerah, even though their origin story was complicated (linked to Genesis 38). The passage supports Chronicles’ larger project: establishing Israel’s post-exile identity by mapping legitimate family lines and remembering formative events tied to those lines.