The census of the tribe of Benjamin reveals a significant shift in their family structure between their arrival in Egypt and their preparation to enter the Land of Israel. While Benjamin originally had ten sons, the later count lists fewer families and introduces several changes to their names [ברכת אשר על התורה]. A central example of this evolution is the family of Ahiram. The primary approach among commentators is that this individual is the same son originally known as Ehi [רש״י, אבן עזרא, חזקוני]. The expanded name is understood in different ways. One perspective suggests it serves as a lasting tribute to Joseph, translating to "my brother" (Ahi) who was "exalted" (Ram) [רש״י]. Alternatively, the name Ahiram might merge two originally distinct names, Ehi and Rosh, into a single person. Because both "Rosh" (head) and "Ram" (exalted) convey the exact same idea of greatness, the identities were combined into Ahiram [מלבי״ם].
The family of Bela also experienced a unique transformation, expanding and splitting into three distinct groups: one named after Bela himself, and two named after his sons, Ard and Naaman [חזקוני]. The presence of Ard and Naaman presents a historical complexity, as they are recorded elsewhere as the direct sons of Benjamin who originally went down to Egypt [אבן עזרא]. To resolve this, it is explained that Benjamin's original sons named Ard and Naaman died without children. Bela, acting as the eldest brother—a status reflected by the name Becher, meaning firstborn, which appears alongside his name in earlier records—married their widows to preserve their legacy. He then named his own children after his deceased brothers. Therefore, while biologically they are the sons of Bela, they are counted as the sons of Benjamin to carry on the names of the dead [מלבי״ם].
Through these generational shifts and the establishment of new family lines, it appears that among all the original sons who arrived in Egypt, only Gera did not ultimately produce an independent family of his own [מלבי״ם].