Mr Lu
You point may make sense in
Spanish but for the fact that it is normal and considered correct in
English to associate people's with the
modern name geographical region they lived in be it hundreds or thousands of years ago, there are many examples to be found in historical and anthroplogical references.
Furtheremore, while it may be nice to use a more "valid" term, this is typically all but impossible in most cases, due to the loss of the language.
Therefore, there is nothing incorrect aboust saying the "early Domincans" were Tainos, even though it may be unattractive to you personally.
Here are just a few examples:
Germania - Wikipedia, the free encyclopedia
Early Americans Arrived Thousands of Years Earlier Than Previously Believed
http://www.answersingenesis.org/docs/2570.asp
African people - Wikipedia, the free encyclopedia