John Wesley on Isaiah 49:12

These - My people shall be gathered from the most remote parts of the earth. He speaks here, and in many other places, of the conversion of the Gentiles, with allusion to that work of gathering, and bringing back the Jews from all parts where they were dispersed, into their own land. Sinim - Either of the Sinites as they are called, Gen 10:17, who dwelt about the wilderness. Or of Sin, a famous city of Egypt, which may be put for all Egypt, and that for all southern parts.