דברי הימים א, פרק ז׳, פסוק ה׳

The tribal census reaches its final summary, capturing both the impressive military strength and the precise family heritage of the entire tribe of Issachar. The total count encompasses the broader families of the tribe. The primary approach among commentators is that these individuals are the descendants of Puah, Jashub, and Shimron, the brothers of Tola who were listed previously. Taking a broader view, [רש״י] explains that the final tally gathers together the sons of Tola, the sons of Uzzi, and all the brave warriors who lived during the reign of King David.

The final number of eighty-seven thousand represents the combined military force drawn from every family within the tribe. Every individual counted in this vast number was carefully registered and traced back to the leaders of his ancestral house. In practical terms, [מצודת דוד] notes that they maintained highly organized, written genealogical record books. Highlighting their precise lineage at the conclusion of the count serves to emphasize that the final figure truly encompasses all the remaining families of Issachar, without a single exception [רלב״ג].