1)
Here it says that Rechavyah was Eliezer's only son. Below (26:25) it says "l'Eliezer Rechavyah Vno vi'Yshayah Vno"!
1.
Malbim: Yeshayah was Rechavyah's son.
2)
What is the meaning of "Ravu"?
1.
Malbim #1: They multiplied greatly.
2.
Malbim #2: They became very esteemed. Shelumis from Bnei Rechavyah was appointed over the wealth Hukdash for the Beis ha'Mikdash - they appointed only great people over it!
