“The sons of Gad lived beside the Reubenites in the land of Bashan as far as Salecah. Joel was the chief. Shapham was the second in command. Janai and Shaphat were in Bashan.”
This implies that the clans of Reuben and Gad on the east Jordan River were living together and not separate. They both lived in the land of Bashan, a hilly district east of the Jordan between the mountains of Hermon and Gilead. Salecah was the eastern boundary of Bashan. Once again, Joel was the chief here as with the Reubenites, but it is not clear if this was another Joel or the same Joel. This is the only mention of this Shapham, who was the second in command, and Janai, who seemed to be in charge of Bashan. However, there were 4 people with the name of Shaphat, who seemed to share power with Janai.
Eugene Finnegan Bible Project 