Where does “əma-ʔ” come from?

əma-ʔ (Proto-Malayic) comes from Proto-Malayo-Chamic əma-ʔ, from Proto-Malayo-Sumbawan əma-ʔ, from Proto-Sunda-Sulawesi əma-ʔ, from Proto-Malayo-Polynesian əma-ʔ, from Proto-Malayo-Polynesian əma.