C. F. Keil and Franz Delitzsch on Ezra 8:1

Ezr 8:1 A list of those heads of houses who returned with Ezra from Babylon to Jerusalem. Compare the parallel list, 1 Esdr. 8:28-40. - Ezr 8:1 The tithe: ”These are the heads of the houses, and (this is) their genealogy, who went up with me.” אבתיהם ראשׁי for בּית־אבתיהם ראשׁי, as frequently. והתיחשׂם, “and their genealogy,” is added, because in the list following the heads of the different houses are not merely enumerated according to their own names, but the names of the races to which they belonged are also stated.