The descendants of Asher

In Numbers, chapter 26:44-47, the descendants of Asher seem to have lost one son, Ishvah, who was in Genesis and later in Chronicles, but is not here in Numbers.  The other three descendants and daughter are exactly the same.  Somehow Beriah is more important since they mention his two descendants, Heber and Malchiel.  Heber is mentioned again in the later works as well as a Heber who is a Kenite.  Once again, Serah is mentioned as a daughter, but there is no group name for her descendants, no Serahites.  Imnah has his clan of the Imnahites.  Ishvi, has his clan of the Ishvites.  Beriah has his clan of the Beriites. His two sons have their own clans, Heber with the clan of the Heberites and Malchiel with the clan of the Malchielites.  Serah was only mentioned as the daughter of Asher, without any other indications.   The clans of the descendants of Asher increased by 12,000, 53,400 from 41,500, with no reason given.  What do you know about Asher?