I'm not sure this is a history question as much as a genetics one. /r/AskAnthropology would be better suited, or maybe just /r/AskScience.

Even though this post has been removed, us mods can still see it. These previous posts may be useful..

• What do we know about histories of connections between Indigenous peoples of the Pacific world?

• How much contact would Polynesian islands have with each other?

• Did people living in Polynesia (and other Pacific isles) know about people on other islands, or were they largely cut off from each other?

• How isolated were most Polynesian islands?