Where does “*kamu” come from?
*kamu (Proto-Malayo-Polynesian) comes from Proto-Malayo-Polynesian (i-)kamu, from Proto-Austronesian (i-)kamu — you, your pl.
*kamu (Proto-Malayo-Polynesian) comes from Proto-Malayo-Polynesian (i-)kamu, from Proto-Austronesian (i-)kamu — you, your pl.