Gaza=
Genesis 10:6,19
[6]And the sons of Ham; Cush, and Mizraim, and Phut, and Canaan.
[19]And the border of the Canaanites was from Sidon, as thou comest to Gerar, unto Gaza; as thou goest, unto Sodom, and Gomorrah, and Admah, and Zeboim, even unto Lasha.
(ancestors of Ham/ Africans)
Whole captivity=
Ezra 6:16,21
[16]And the children of Israel, the priests, and the Levites, and the rest of the children of the captivity, kept the dedication of this house of God with joy,
[21]And the children of Israel, which were come again out of captivity, and all such as had separated themselves unto them from the filthiness of the heathen of the land, to seek the LORD God of Israel, did eat,
Here we see that Israel is being referred to as the "captivity" because they were in slavery.
Nehemiah 8:17
[17]And all the congregation of them that were come again out of the captivity made booths, and sat under the booths: for since the days of Jeshua the son of Nun unto that day had not the children of Israel done so. And there was very great gladness.
Edom=
Genesis 25:25-26
[25]And the first came out red, all over like an hairy garment; and they called his name Esau.
[26]And after that came his brother out, and his hand took hold on Esau's heel; and his name was called Jacob: and Isaac was threescore years old when she bare them.
Genesis 25:30
[30]And Esau said to Jacob, Feed me, I pray thee, with that same red pottage; for I am faint: therefore was his name called Edom.
later on in history Edom had relations with the sons of Japheth due to war.
Jasher 90:1-11
[1]At that time in the fifth year after the children of Israel had passed over Jordan, after the children of Israel had rested from their war with the Canaanites, at that time great and severe battles arose between Edom and the children of Chittim, and the children of Chittim fought against Edom.
[2]And Abianus king of Chittim went forth in that year, that is in the thirty-first year of his reign, and a great force with him of the mighty men of the children of Chittim, and he went to Seir to fight against the children of Esau.
[3]And Hadad the king of Edom heard of his report, and he went forth to meet him with a heavy people and strong force, and engaged in battle with him in the field of Edom.
[4]And the hand of Chittim prevailed over the children of Esau, and the children of Chittim slew of the children of Esau, two and twenty thousand men, and all the children of Esau fled from before them.
[5]And the children of Chittim pursued them and they reached Hadad king of Edom, who was running before them and they caught him alive, and brought him to Abianus king of Chittim.
[6]And Abianus ordered him to be slain, and Hadad king of Edom died in the forty-eighth year of his reign.
[7]And the children of Chittim continued their pursuit of Edom, and they smote them with a great slaughter and Edom became subject to the children of Chittim.
[8]And the children of Chittim ruled over Edom, and Edom became under the hand of the children of Chittim and became one kingdom from that day.
[9]And from that time they could no more lift up their heads, and their kingdom became one with the children of Chittim.
[10]And Abianus placed officers in Edom and all the children of Edom became subject and tributary to Abianus, and Abianus turned back to his own land, Chittim
[11]And when he returned he renewed his government and built for himself a spacious and fortified palace for a royal residence, and reigned securely over the children of Chittim and over Edom.
This was the mix/ relations between Japheth and Edom due to this war that happened when the land of Chittim/Kittim aka the romans/ grecians came to conquer Edom.
There is also a prophecy attached to this stating that Esau's seed will be spoiled in:
Jeremiah 49:10
[10]But I have made Esau bare, I have uncovered his secret places, and he shall not be able to hide himself: his seed is spoiled, and his brethren, and his neighbours, and he is not.
