Genesis 10:5

By these were the isles of the Gentiles divided in their lands; every one after his tongue, after their families, in their nations.

1. The "isles of the Gentiles" were apparently populated by either the sons of Javan, or all the posterity of Japheth - it isn't very clear.
2. These people were regarded as Gentiles. Obviously, they weren't descendants of Shem, so they were not semitic.
3. Although the origin of the naming of the island of Java is unclear, I can't help believing that it may have been among the islands populated by the sons of Javan. Just speculation, though.