“Shallum was the son of Shaul. Mibsam was his son. Mishma was his son. The sons of Mishma were Hammuel, Zaccur, and Shimei. Shimei had sixteen sons and six daughters. However, his brothers did not have many children, so that all their family did not multiply like the Judeans.”
Here there are 5 generations descendent from Simeon via Shallum who must have been the most important of Simeon’s sons. There were over 15 people with the name of (1) Shallum, including a King of Israel (743 BCE). Interesting enough both (2) Mibsam and (3) Mishma were the names of the sons of Ishmael. I am not sure whether this is a coincidence or an attempt to say something here. This is the only mention of the name Hammuel, the son of Mishma. There are 5 or 6 people with the name of Zaccur. There 16 different biblical figures with the name of (4) Shimei. This Shimei was very productive with over 22 children. However, his brothers and their families did not multiply like the family of Judah. This might be the reason that the family of Simeon will blend and become simply Judah.